旱地秸秆覆盖条件下作物减产的原因及作用机制分析

结合多年的田间试验研究，对中国旱地秸秆覆盖的方法、效果、减产现象及其原因进行了总结和分析，结果表明：虽然绝大多数资料显示秸秆覆盖能明显改善土壤水分状况、提高作物产量，但覆盖条件下作物不增产甚至减产的现象不容忽视，其原因可能与覆盖导致土壤水分、温度和供肥状况等因素的变化有关，作用机理尚需深入探讨，并提出了进一步研究的思路。

Cause and mechanism of crop yield reduction under straw mulch in dryland

On the basis of field experiments conducted by authors for a few years, the methods, effect, reduction of crop yield and its reasons for straw mulch in dryland were summarized and analyzed. It was showed that the reduction of crop yield under straw mulch should be paid more attention to although the most of the data showed the remarkable improvement of soil water condition and crop yield under straw mulch. The reasons for yield reduction probably due to the changes of soil water content, soil temperature, fertility and other factors resulted from straw mulch. Further researches are needed. Some suggestions were given for further researches.