摘要
[目的]研究不同造林模式对改善土壤的差异和机理。[方法]对甘肃省天水市秦州区退耕还林(草)工程3种造林模式土壤的含水量、容重、总孔隙度、水稳性团粒组成和土壤有机碳进行了比较分析。[结果]与农田对照相比,退耕还林(草)3种造林模式的土壤含水量均显著地高;0～20cm表层的土壤容重均显著地高,而20～60cm土层的则均显著地低;0～20cm表层的土壤总孔隙度显著地低,而20～60cm土层的则均显著地高;各土层土壤不同粒径的土壤团粒百分含量高于相应的农田;土壤有机碳均随土壤深度的增加而减小,说明退耕还林有利于土壤有机碳向下输送。3种造林模式中以乔草型效果为最好。[结论]实施7年退耕还林(草)后,与农田相比,明显改善了土壤物理性质和土壤结构,提高了土壤保水和蓄水性能。
[ Objective ] The study aimed to study the difference and the mechanism of different afforestation models on improving the soil. [ Method ] The soil water content, soil bulk, soil total porosity, soil water-stable aggregates structure and soil organic carbon were compared un- der 3 afforestation models used in the engineering of returning farmland to forest （grass） in Qinzhou District in Tianshui City of Gansu Prov- ince. [ Result ] Under 3 afforestation models used in returning farmland to forest （grass）, compared with the farmland, the soil water contents were all obviously higher; the soil bucks in 0 -20 cm soil surface layer were all obviously higher, while that in 20 -60 cm soil layer were all obviously lower; the soil total porosities in 0 -20 cm soil surface layer were all obviously lower, while that in 20 -60 cm soil layer was all ob- viously higher; the percentage content of soil aggregates with different grain sizes In the various soil layers were higher than that in the corre- sponding farmland; the soil organic carbon contents were decreased with the increase of soil depth, showing that retuming farmland to forest was propitious to transport the soil organic carbon downward. Among 3 afforestation models, the model of returning to the tree grass could get optimum effect. [ Conclusion] Implement of returning farmland to forest （grass） for 7 years could significantly improve the soil physical properties and soil structure, and increase the capability of soil water conservation and water storage compared to the farmland.
出处
《安徽农业科学》
CAS
北大核心
2010年第30期16980-16983,共4页
Journal of Anhui Agricultural Sciences
基金
文冠果栽培技术研究与示范(2008-8)
关键词
退耕还林工程
造林模式
土壤物理性质
土壤有机碳
甘肃省天水市
Engineering of returning farmland to forest
Afforestation model
Physical properties of soil
Soil organic carbon
.Tianshui City of Gansu Province
