生物质还田及栽培方式对土壤环境保护的探讨

作物产量是反映土壤肥力最好的综合指标,而作物产量与土壤胶体原土复合量间呈明显的相关性(r=0.7032**,t=4.53>t0.01=2.83。研究结果表明:生物质还田与土壤有机质增值呈明显正相关,土壤培肥后实际复合量增值(%)与土壤有机质增率(%)密切相关(r=0.8964**,t=7.84>t0.01=2.95),其产量水平的变迁与土壤有机无机复合量增减动态相一致。绿肥、麦秸还田和粮草轮作、绿麦间套等栽培,有利土壤有机无机复合量的提高,改善土壤理化性状,增强土壤酶活性,是保护土壤生境,涵养水源切实可行的有效措施。同时,土壤有机无机复合量和土壤酶活性也是衡量农业措施及地力的指标。

Study on Effects of Raw Organic Matter Return and Crop Systems on Soil Environment

Crop yields is comprehensive index of soil fortility.Crop yields had good correleation to soil organic-mineral complex guantity (r=0.7032,t=4.53>t_0.01=2.83.Comparing simulated results with measured values showed that the raw organic matter return was correlated to soil organic matter,and showed that increase in soil organic-mineral complex was correlated to in crement of soil organic matter (r=0.864^**,t=7.84>t_0.01=2.95),and increased the crop yields and improved soil organicmineral complex guantity.Return of green manure and wheat straw,rotation of crap and green mapure,and intercropping of whead and green manure could improve soil organic-mineral complex,soil physical progerty and activity of soil enzymes.It was an effective and feasible measure to maintain good soil environment and soil moisture.Soil organic-mineral complex and activity of soil enzymes can he used as indicator for soil fertilitg and management of land at the same time.