农田生态系统杂草的养分和水分效应研究

Ecological Effects of Weeds on Soil Water and Soil Nutrient in Farmland Ecosystem

通过田间试验研究了冬小麦田杂草的土壤养分和水分效应,发现田间保留一定量的杂草能够提高表层土壤水分含量,尤以0 2 0cm层次表现明显,显示出很好的土壤水分保持效应。同时在保留杂草的处理中,0 6 0cm土壤碱解氮储量消耗最少,速效P储量在增加,而速效K储量增加得最多。并且在冬小麦返青期不论土壤养分情况怎么样,在收获后都以保留杂草的处理土壤速效养分(碱解氮、速效磷和速效钾)储量最高。

Ecological effects of weeds on soil water and soil nutrient were studied in winter wheat. The results showed that weeds, in winter wheat farmland, raised soil water content, especially in 0~20 cm profile. Moreover, in 0~60 cm profile, the loss of available-N was the least and the total amount of available-P was increased (comparatively, other treatment's were decreased) and available-K increment was the maximum in WK(weeds keep) treatment. Furthermore, the total amount of nutrient(available-N,P and K) of WK treatment was the most in harvest period.