Response of soil nutrients and enzyme activities to contour reverse-slope land preparation in slope forest land of central Yunnan Province
[Objective]The aim is to reveal the mechanism of ecological restoration by analyzing the effects of contour reverse-slope terrace on soil nutrients and enzyme activities during the restoration of degraded slope forest.[Method]The degraded Pinus yunnanensis slope forest land in Yizhe minor watershed of Songhuaba water source area in Kunming City was taken as the research object.1-year and 10-year contour reverse-slope terrace preparation trials were set up,with the original slope as a control(ck).Soil nutrients contents and enzyme activities above and below the terrace,as well as those at different soil depths(0-10,10-20,20-30,and 30-40 cm)were systematically compared.[Result](1)Contour reverse-slope terraces displayed a significant increase in soil nutrient contents(P＜0.05),and the nutrients such as carbon,nitrogen,and phosphorus increased by 15.3％-236.2％.The nutrient levels below the terrace were higher than those above the terrace,and the increase in surface soil(0-10 cm)was the most significant.(2)The activities of soil urease,sucrase,acid phosphatase,and catalase in 10-year plots were significantly higher than those in ck(P＜0.05),and the 4 enzyme activities increased by 3.7％-587.5％.Soil enzyme activities below the terrace were still higher than those above the terrace.The increase in enzyme activity in the surface soil was significant(P＜0.05).(3)Redundancy analysis showed that soil enzyme activities were better interpreted by soil nutrient indicators after soil preparation of contour reverse-slope terrace measures,with ck,1-year plots,and 10-year plots accounting for 68.0％,88.0％,and 92.7％,respectively.The positive correlation between soil nutrients contents and enzyme activities increased after soil preparation of contour reverse-slope terrace measures,and the range of correlation coefficients and the number of highly significant groups(P＜0.01)increased from 0.26-0.99 and 1 group in ck to 0.78-1.00 and 15 groups in 10-year plots,respectively.[Conclusion]The implementation of contour reverse-slope terrace soil preparation in degraded slope forest can increase the accumulation of soil nutrient,stimulate soil enzyme activity,increase the coordination between the two in soil physiological and biochemical reaction,and ultimately improve soil quality.[Ch,4 fig.1 tab.35 ref.]
soil nutrientssoil enzyme activitiescontour reverse-slope terracedegraded slope forest land
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