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在河西内陆河流域,覆盖免耕(NTS)、秸秆还田(CTS)和常规耕作(CTB)结合不同储水定额对豌豆所作的研究表明:在作物休闲期,覆盖免耕可以有效的增加土壤的蓄水和保墒能力,较常规耕作和秸秆还田的蒸发率分别降低8·18%和7·33%;土壤蒸发率随储水定额的增加呈现增大趋势,说明增大储水定额将增大无效蒸发,浪费宝贵的水资源。但覆盖免耕和秸秆还田也会导致土壤的热传导性能降低,对太阳的反射强度增加,使春播时地温偏低,出苗困难,苗密度较常规耕作分别降低25·88万株·hm-2和18·87万株·hm-2。对水分利用效率(WUE)的研究表明,在出苗密度降低的情况下,3种耕作方式之间的水分利用效率差异并不显著,说明在作物生长中后期,覆盖免耕和秸秆还田的经济产量增加潜力大于常规耕作。在储水定额>1350m3·hm-2时,水分利用效率将显著降低。
In the Hexi Inland River Basin, studies on peas with different storage quotas covering NTS, CTS and CTB showed that no-tillage can be effectively increased during crop recreation The soil water storage and soil moisture retention capacity decreased by 8.18% and 7.33% respectively compared with that of conventional tillage and straw returning. The soil evaporation rate showed an increasing trend with the increase of water storage quota, indicating that increasing the storage quota Will increase the ineffective evaporation, wasting precious water resources. However, no-tillage and straw-returning also resulted in lower soil thermal conductivity, increased solar reflectance, lower ground temperature during spring seeding, and less seedling emergence. Seedling density was reduced by 258,800 hm-2 And 188700 plants · hm-2. Studies on water use efficiency (WUE) showed that there was no significant difference in water use efficiency among the three tillage practices when the seedling density was reduced, indicating an economy covering no-till and straw returning to the field during the latter part of crop growth The potential for increased production is greater than conventional farming. Water storage efficiency> 1350m3 · hm-2, water use efficiency will be significantly reduced.