Minqin oasis in the lower reaches of the Shiyang River is a main natural barrier for the Wuwei Basin. Due to the combined influence of human activities and natural factors in the past half a century, water quality in ...Minqin oasis in the lower reaches of the Shiyang River is a main natural barrier for the Wuwei Basin. Due to the combined influence of human activities and natural factors in the past half a century, water quality in the lower reaches of the Shiyang River decreased and ecological environment deteriorated, which influenced sustainable development of this area and surrounding area seriously. This paper analyzed current situation and reasons of the deteriorated ecological environment in the lower reaches of the Shiyang River, and proposed that water environment regulation was the primary task in the eco-environment control of Minqin area, specifically,(a) By using existing policies, accelerating the construction of water-saving agriculture in the middle reaches of the Shiyang River, water quantity in the lower reaches would be guanranted, water shortage for agricultural production and ecological use in Minqin oasis would be relieved;(b) Unreasonable human activities such as overexploitation of underground water should be controlled strictly;(c) Water conservancy project should be developed vigorously to ensure rate of flow. It was expected that the above schemes would contribute to the benign circulation of ecological environment in Minqin oasis.展开更多
[Objective] The paper was to study wind-break and sand-fixation functions of forage plants in desert area. [Method]Based on the survey data of four major wind-break and sand-fixation plants( Haloxylon ammondendron,Art...[Objective] The paper was to study wind-break and sand-fixation functions of forage plants in desert area. [Method]Based on the survey data of four major wind-break and sand-fixation plants( Haloxylon ammondendron,Artemisia arenaria,Nitraria tangutorum and Ephedra przewalskii) in Minqin desert area,the longitudinal section area and the sandpile volume of an individual plant and per unit area were calculated. The wind-break and sand-fixation functions of four major plant communities were comparatively analyzed. [Result] The wind-break functions of an individual plant( cluster) successively were N. tangutorum > H. ammondendron > A. arenaria and E. przewalskii; the sand-fixation functions of an individual plant( cluster) successively were N. tangutorum > E. przewalskii; the wind-break functions per unit area successively were A. arenaria > H. ammondendron > N. tangutorum > E. przewalskii; the sand-fixation functions per unit area were N. tangutorum > E. przewalskii; the wind-break and sand-fixation function per unit area were N. tangutorum > A. arenaria > H. ammondendron >E. przewalskii.[Conclusion]A. arenaria can be selected for only wind-break,and N. tangutorum can be chosen for only sand-fixation. If given consideration to both,N. tangutorum and A. arenaria must be selected.展开更多
Wind energy density was calculated based on average wind speed and air density,and the distribution of wind energy density and its relation with the distribution of sandstorm in Hexi Corridor in Gansu Province were re...Wind energy density was calculated based on average wind speed and air density,and the distribution of wind energy density and its relation with the distribution of sandstorm in Hexi Corridor in Gansu Province were revealed. Moreover,the ecological effect of wind power development on the reduction of local sandstorm and sand flow was estimated. The results show that if the maximum rotor power coefficient of a wind-driven generator is 0. 5,the forward movement speed of sand body( or desert)( 8 827 km × 1 m × 1 m) will reduce by 1 m every year through the development and conversion of wind energy resources in Hexi Corridor. If the proportion of exploitable wind energy resources is 50%,the forward movement speed of sand body( or desert)( 4 414 km × 1 m × 1 m) will decrease by 1 m every year. It is clearly seen that wind power industry has obvious effects on the control of sandstorm and sand flow. Wind energy resources in Hexi Corridor have great development potential,and wind power industry can bring both ecological and economic benefit to people.展开更多
The instability of climate in Minqin desert area during the process of global warming was analyzed based on meteorological data during 1961-2013. The results show that the instability of monthly average temperature in...The instability of climate in Minqin desert area during the process of global warming was analyzed based on meteorological data during 1961-2013. The results show that the instability of monthly average temperature in January and April increased. Isothermal date in February was 10.36 d earlier from 1961 to 2013. The instability of extreme maximum temperature in December and January enhanced. The instability of extreme minimum temperature in July increased. The coefficient of variation of extreme minimum temperature in May was up to 287.3%. The instability of average precipitation in January enhanced. At the same time,the stability of annual average precipitation increased. The stability of climate is more worthy of attention.展开更多
[ Objective ] To elucidate the change trend in stability and ecological effects of plant communities in desert along with global wanning. [ Method ] The data of site-specific observation on five main plant communities...[ Objective ] To elucidate the change trend in stability and ecological effects of plant communities in desert along with global wanning. [ Method ] The data of site-specific observation on five main plant communities at ten plots in Minqin desert area were used to analyze the stability and ecological effects of desert plant communities by using two indicators vegetation coverage and projective cover degree. [ Results ] The vegetation coverage of Artemisia arenaria and Ephedra przewalskii, and the projective cover degree of A. arenaria and man-made Haloxylon ammodendron forest decreased remarkably; and the vegetation coverage of Ni- traria tangutorum was also decreased to some extent. [ Conduslon] （1） The plant communities with poor vegetation coverage gives a relatively strong stability, while that with high vegetation coverage has a relatively poor stability; （2） the yearly precipitation is the determinant of vegetation coverage and projective cover deglee; （3） the ecological function is found to be most remarkable in per unit area N. tangutorum, followed by E. przewalskii and N. tangutorum ＋H. ammodendron, and least in per unit area A. Arenaria. The vegetation is sparse in desert and plant branches does not distribute regularly, thus the crown-based vegetation coverage can not reflect the actual surface coverage.展开更多
This paper analyzed relative ecological value of several major plants in Minqin desert grassland using layered projection of plant canopy. The results showed that ecological functions of natural Nitraria tangutorum an...This paper analyzed relative ecological value of several major plants in Minqin desert grassland using layered projection of plant canopy. The results showed that ecological functions of natural Nitraria tangutorum and Ephedra sinica woods of a unit area were much better than those of artifi cial Haloxylon ammodendron woods, relative ecological value of N. tangutorum, E. sinica and Artemisia desertorum were much higher than that of artifi cial H. ammodendron woods. Layered projection explains clearly the ecological functions and relative ecological value of desert vegetation of the same coverage. It is inaccurate to indicate wind prevention and sand fi xation of desert vegetation in deserts using ecological function service value and ecological niche calculated on the basis of two-dimensional vegetation coverage, but three-dimensional projection degree should be applied to indicate ecological functions and relative ecological value of vegetation. Application of layered projection of plants in calculating ecological functions and relative ecological value of desert plants(vegetation) is the innovation point of this research.展开更多
基金Sponsored by Sci-tech Innovation Program of Gansu Provincial Department of Agriculture and Animal Husbandry(GNXC-2012-45)National Natural Science Foundation of China(41161049,31160264)
文摘Minqin oasis in the lower reaches of the Shiyang River is a main natural barrier for the Wuwei Basin. Due to the combined influence of human activities and natural factors in the past half a century, water quality in the lower reaches of the Shiyang River decreased and ecological environment deteriorated, which influenced sustainable development of this area and surrounding area seriously. This paper analyzed current situation and reasons of the deteriorated ecological environment in the lower reaches of the Shiyang River, and proposed that water environment regulation was the primary task in the eco-environment control of Minqin area, specifically,(a) By using existing policies, accelerating the construction of water-saving agriculture in the middle reaches of the Shiyang River, water quantity in the lower reaches would be guanranted, water shortage for agricultural production and ecological use in Minqin oasis would be relieved;(b) Unreasonable human activities such as overexploitation of underground water should be controlled strictly;(c) Water conservancy project should be developed vigorously to ensure rate of flow. It was expected that the above schemes would contribute to the benign circulation of ecological environment in Minqin oasis.
基金Supported by National Natural Science Foundation of China(41671528,41661064)
文摘[Objective] The paper was to study wind-break and sand-fixation functions of forage plants in desert area. [Method]Based on the survey data of four major wind-break and sand-fixation plants( Haloxylon ammondendron,Artemisia arenaria,Nitraria tangutorum and Ephedra przewalskii) in Minqin desert area,the longitudinal section area and the sandpile volume of an individual plant and per unit area were calculated. The wind-break and sand-fixation functions of four major plant communities were comparatively analyzed. [Result] The wind-break functions of an individual plant( cluster) successively were N. tangutorum > H. ammondendron > A. arenaria and E. przewalskii; the sand-fixation functions of an individual plant( cluster) successively were N. tangutorum > E. przewalskii; the wind-break functions per unit area successively were A. arenaria > H. ammondendron > N. tangutorum > E. przewalskii; the sand-fixation functions per unit area were N. tangutorum > E. przewalskii; the wind-break and sand-fixation function per unit area were N. tangutorum > A. arenaria > H. ammondendron >E. przewalskii.[Conclusion]A. arenaria can be selected for only wind-break,and N. tangutorum can be chosen for only sand-fixation. If given consideration to both,N. tangutorum and A. arenaria must be selected.
基金Supported by National Natural Science Foundation of China(41671528,41661064)
文摘Wind energy density was calculated based on average wind speed and air density,and the distribution of wind energy density and its relation with the distribution of sandstorm in Hexi Corridor in Gansu Province were revealed. Moreover,the ecological effect of wind power development on the reduction of local sandstorm and sand flow was estimated. The results show that if the maximum rotor power coefficient of a wind-driven generator is 0. 5,the forward movement speed of sand body( or desert)( 8 827 km × 1 m × 1 m) will reduce by 1 m every year through the development and conversion of wind energy resources in Hexi Corridor. If the proportion of exploitable wind energy resources is 50%,the forward movement speed of sand body( or desert)( 4 414 km × 1 m × 1 m) will decrease by 1 m every year. It is clearly seen that wind power industry has obvious effects on the control of sandstorm and sand flow. Wind energy resources in Hexi Corridor have great development potential,and wind power industry can bring both ecological and economic benefit to people.
基金Supported by National Natural Science Foundation of China(41261102,41661064)
文摘The instability of climate in Minqin desert area during the process of global warming was analyzed based on meteorological data during 1961-2013. The results show that the instability of monthly average temperature in January and April increased. Isothermal date in February was 10.36 d earlier from 1961 to 2013. The instability of extreme maximum temperature in December and January enhanced. The instability of extreme minimum temperature in July increased. The coefficient of variation of extreme minimum temperature in May was up to 287.3%. The instability of average precipitation in January enhanced. At the same time,the stability of annual average precipitation increased. The stability of climate is more worthy of attention.
基金Supported by Special Program for Key Basic Research of the Ministry of Science and Technology,China(2014CB460611)
文摘[ Objective ] To elucidate the change trend in stability and ecological effects of plant communities in desert along with global wanning. [ Method ] The data of site-specific observation on five main plant communities at ten plots in Minqin desert area were used to analyze the stability and ecological effects of desert plant communities by using two indicators vegetation coverage and projective cover degree. [ Results ] The vegetation coverage of Artemisia arenaria and Ephedra przewalskii, and the projective cover degree of A. arenaria and man-made Haloxylon ammodendron forest decreased remarkably; and the vegetation coverage of Ni- traria tangutorum was also decreased to some extent. [ Conduslon] （1） The plant communities with poor vegetation coverage gives a relatively strong stability, while that with high vegetation coverage has a relatively poor stability; （2） the yearly precipitation is the determinant of vegetation coverage and projective cover deglee; （3） the ecological function is found to be most remarkable in per unit area N. tangutorum, followed by E. przewalskii and N. tangutorum ＋H. ammodendron, and least in per unit area A. Arenaria. The vegetation is sparse in desert and plant branches does not distribute regularly, thus the crown-based vegetation coverage can not reflect the actual surface coverage.
基金Sponsored by Pilot Study of National 973 Plan(2014CB460611)The National Natural Science Fund(41261102)
文摘This paper analyzed relative ecological value of several major plants in Minqin desert grassland using layered projection of plant canopy. The results showed that ecological functions of natural Nitraria tangutorum and Ephedra sinica woods of a unit area were much better than those of artifi cial Haloxylon ammodendron woods, relative ecological value of N. tangutorum, E. sinica and Artemisia desertorum were much higher than that of artifi cial H. ammodendron woods. Layered projection explains clearly the ecological functions and relative ecological value of desert vegetation of the same coverage. It is inaccurate to indicate wind prevention and sand fi xation of desert vegetation in deserts using ecological function service value and ecological niche calculated on the basis of two-dimensional vegetation coverage, but three-dimensional projection degree should be applied to indicate ecological functions and relative ecological value of vegetation. Application of layered projection of plants in calculating ecological functions and relative ecological value of desert plants(vegetation) is the innovation point of this research.
