Study On Benefits Of Soil Improvement Of Countermeasures Of Soil And Water Conservation

Red soil is regional in Jiangxi province. Serious soil and water loss, caused by climate, precipitation and unreasonable use, etc, has affected the sustainability and stability of agricultural production and social economic development. The thesis regards grass, tillage and terrace in the ecological technology garden as research object. Based on the measure and analysis of soil physics, soil chemstry and anti-erodibility, it was carried out that the study of soil improvement of soil and water conservation. Its objects are that choice of countermeasures of harnessing red eroded land and the assessment of soil improvement benefits.The results have suggested that,(1) the total effects of improving soil physical properties are that grass group>tillage group>terrace group. Compared with CK1and CK2, mean soil bulk density was reduced by9%and7%respectively, mean soil total porosity was increased by8%and7%respectively, mean non-capillary porosity was increased by52%and47%respectively, mean maximum moisture capacity was increased by19%and decreased by47%, capillary water capacity was increased by10%and12%respectively, field moisture capacity was increased by44%and25%respectively; In the group of terrace, mean soil bulk density was reduced by5%and3%respectively, mean soil total porosity was increased by4%and3%respectively, mean capillary porosity was increased by6%and5%respectively; Mean maximum moisture capacity was increased by9%and6%, field moisture capacity was increased by25%and10%respectively; Compared with CK1, in the group of tillage, mean soil bulk density was reduced by5%, mean soil total porosity, capillary porosity, non-capillary porosity was increased by4%,3%and12%, mean maximum moisture capacity was increased by10%, capillary water capacity was increased by8%, field moisture capacity was increased by25%;(2) the total effects of improving soil chemical properties and soil nutrient conditions are that tillage group>grass group>terrace group. Compared with CK1, in the group of grass, tillage and terrace soil organic matter content was increased by11%,11%and5%respectively, mean soil total nitrogen was increased by6%,9%and2%respectively, mean soil available N content was increased by5%,13%and4%respectively every year, the average contents of total P was increased by10%,17%and7%respectively every year, mean soil available phosphorus content was increased by140%,232%and73%respectively every year;(3) the total effects of improving soil anti-erodibility are that terrace group>grass group>tillage group. Compared with CK1, in grass group, tillage group and terrace group,>0.05mm soil microaggregate content was increased by13.86%,11.55%and13.85% respectively. And their structure damage rate was32.65%,46.25%and36.82%respectively,their WSA was56.37%,41.93%and51.78%respectively, their Eva was6.42%,9.78%and8.31%respectively, their EMWDwas1.59,1.16and1.21mm respectively;(4) the comprehensive benefits of improving soil are that grass group>tillage group>terrace group.