秸秆还田对农田生态系统及作物生长的影响

秸秆还用是利用秸秆的一种有效方式．大量试验表明，秸秆还田会对土壤产生多种作用：能改善土壤物理性状，降低土壤容重，增加孔隙度；能增加土壤微生物数量，增强生物和多数酶的活性；增加土壤有机质积累和养分含量；能改变土壤腐殖质组成及特性；影响作物生长发育，促进作物产量提高．其中，秸秆覆盖还田还具有蓄水保墒，调节地温和保持水土，抑制田间杂草等功能．总之，秸秆还田对农田具有良好的生态效应。

The Effect of Stubble Return on Agro-ecological System and Crop G rowth

Stubble return to farmland is an effective way of using stubbles. A lot of research showed that stubble return had positive effects as improving soil physical properties, reducing soil bulk density, increasing soil hole capacities, enhanc- ing the accumulation of soil micro biomass, strengthening the activity of most enzymes, augmenting organic matters, accu- mulating nutrients in soil, changing soil humus components and its quality, influencing crop growth, so promoting crop yield. In addition, soil temperature adjustment, soil and water conservation, and weed inhibition were also observed. In brief, stubble return has good ecological effects on agriculture.