摘要
结合长期定位试验和室内分析,研究了侵蚀红壤区不同水土保持措施下坡地土壤容重、孔隙度、持水性能和团聚度等因子的变化,分析了不同水土保持措施的土壤改良效果。研究结果表明,不同水土保持措施显著影响侵蚀红壤区坡地土壤容重、持水量因子(最大持水量、毛管持水量和田间持水量)、湿筛团聚体组成、湿筛MWD、结构破坏率、团聚体稳定性等因子,但是对孔隙度因子(总孔隙度、毛管孔隙度和非毛管孔隙度)、分散率、干筛团聚体组成和干筛MWD影响不显著。牧草措施可显著降低土壤容重、结构破坏率和分散率,提高土壤总孔隙度、各持水量因子、大团聚体(>0.25mm)含量和团聚体稳定性,显著改善土壤物理性质状况。研究区可用土壤持水量因子作为衡量土壤肥力状况的简化指标。
Combined with long-term location test and indoor analysis,the soil physical properties such as soil bulk density,soil porosity,soil water retention,and soil aggregation degree in gentle sloping land of erosive red soil region under different soil and water conservation measures were studied,and the soil improvement effects of different soil and water conservation measures were analyzed. The results showed that different soil and water conservation measures all had a significant impact on soil bulk density,soil water retention factors（ maximum water retention,capillary water retention,and field water retention）,wet-sieved aggregate composition,wet-sieved MWD（ mean weight diameter）,rate of structure deterioration,and aggregate stability of erosive red-soil sloping land,but they had no any significant impacts on soil porosity factors（ total porosity,capillary porosity,and noncapillary porosity）,soil dispersion rate,dry- sieved aggregate composition,and dry- sieved MWD. The forage grass planting measure could significantly reduce soil bulk density,rate of structure deterioration,and soil dispersion rate,and increase soil total porosity,all soil water retention factors,large aggregate（ 〉0.25 mm） content,and aggregate stability,thus significantly improved soil physical properties. In the studied region,the soil water retention could be used as a simple indicator for the evaluation of soil fertility.
作者
喻荣岗
谢颂华
张华明
陈浩
左继超
沈发兴
YU Rong-gang XIE Song-hua ZHANG Hua-ming CHEN Hao ZUO Ji-chao SHEN Fa-xing(Jiangxi Institute of Soil and Water Conservation, Nanchang 330029, China Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang 330029, China)
出处
《江西农业学报》
CAS
2016年第11期85-89,123,共6页
Acta Agriculturae Jiangxi
基金
国家自然科学基金资助项目(41461060)
关键词
侵蚀红壤区
水土保持措施
土壤物理性质
Red soil erosion region
Soil and water conservation measures
Soil physical properties
