【摘要】 为了研究南方红壤坡地不同水土保持耕作措施的蓄水保土和固碳减排效应,通过江西省水土保持生态科技园5a的定位观测资料,对3种耕作措施(横坡间作,纵坡间作和果园清耕)条件下坡面产流产沙及土壤碳库的变化进行了分析。结果表明:(1)与裸露对照相比,3种耕作措施均具有一定的蓄水减流和保土减沙效应,其减流率在21.16%～75.32%,减沙率在38.08%～80.57%,红壤坡地不同耕作措施的蓄水保土效应从优至劣排序为:横坡间作>纵坡间作>果园清耕;(2)与裸露对照相比,3种耕作措施均具有提高土壤有机碳质量分数和增加土壤碳库的作用,其表层土壤总有机碳质量分数增加幅度为37.24%～66.34%,土壤碳储量增加幅度为35.23%～55.34%,红壤坡地各项耕作措施实施5a后的表层土壤碳库指数和土壤碳储量大小排序均为:纵坡间作>横坡间作>果园清耕;(3)间作措施的蓄水保土和固碳减排效益优于清耕措施,适宜在红壤坡地推广。更多还原

【Abstract】 In order to study effects of different tillage methods on soil and water conservation(SWC) and soil carbon stock in red-soil slope land in Southern China,field experiments were carried out in the representative area named Jiangxi Eco-science Park of SWC to investigate the surface runoff,sediment,total organic carbon(TOC) and carbon pool index(CPI) of soils in contour strip intercropping,downslope strip intercropping and clean tillage in orchards with the data of five-year agriculture measurement.The results indicated as follows:(1) Compared with the control(CK),runoff reduction rates of the three measures varied between 21.16% and 75.32%,and sediment reduction rates of them varied between 38.08% and 80.57%.It showed that these agricultural measures have great effects on reduction of runoff and sediment with a descendant order of contour strip intercropping,downslope strip intercropping and clean tillage.(2) Compared with CK,soil TOCs and CPIs of contour strip intercropping,downslope strip intercropping and clean tillage increased by 37.24% to 6.34% and 35.23% to 55.34%,respectively.The results also showed that these agriculture tillage measures have increased soil C and followed a descendant order of downslope strip intercropping,contour strip intercropping and clean tillage.(3) These results indicated that strip intercropping has better benefits than clean tillage and can be applied widely in red-soil hilly region.更多还原