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作者	单位
杨楠，逄蕾，王明，郑浩飞，苟磊刚	（1.甘肃省干旱生境作物学国家重点实验室,甘肃兰州 730070； 2.甘肃农业大学农学院,甘肃兰州 730070）

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中文摘要:

为明确不同覆盖措施对陇中旱作梯田土壤微生态及春小麦产量的影响,基于甘肃省农业科学院定西试验站的定位试验，采用单因素随机区组设计，设置地膜覆盖（PM）、秸秆碎秆覆盖还田（SR）和秸秆整秆带状覆盖（SM）3种覆盖措施，以无覆盖为对照（CK），探究不同覆盖措施下土壤理化性质、酶活性、土壤生态系统多功能性（EMF）及春小麦产量的变化。结果表明，与CK相比，SR处理显著提高土壤有机碳、全氮、全磷、速效氮、速效磷含量，增幅分别为18.4%、16.9%、14.6%、16.6%、12.7%；SM处理显著提高土壤有机碳、速效氮和速效磷含量，增幅分别为13.3%、28.4%、9.6%。3种覆盖措施均显著提高土壤含水量，其中PM增幅度最大（93.3%）。SR处理对土壤酶活性影响最显著，PM和SM处理次之。各处理土壤EMF的大小表现为SR>PM>SM>CK。PM和SR处理产量分别显著增加13.4%和18.2%。综合来看，秸秆碎秆覆盖还田可作为当地适宜的覆盖措施。

英文摘要:

To clarify the effects of different mulching measures on the soil microecology and spring wheat yield in dryland terraces of Longzhong, a field experiment was conducted at the Dingxi Experimental Station of the Gansu Academy of Agricultural Sciences. A single-factor randomized block design was adopted with three mulching treatments: plastic film mulching(PM), straw residue mulching and incorporation(SR), and strip mulching with intact straw(SM), with no mulching(CK) as the control. The changes of these mulching measures on soil physicochemical properties, enzyme activities, ecosystem multifunctionality(EMF), and spring wheat yield were investigated. The results showed that, compared with CK, SR treatment significantly increased soil organic carbon, total nitrogen, total phosphorus, available nitrogen, and available phosphorus contents by 18.4%, 16.9%, 14.6%, 16.6%, and 12.7%, respectively. SM treatment significantly increased soil organic carbon, available nitrogen, and available phosphorus by 13.3%, 28.4%, and 9.6%, respectively. All three mulching treatments significantly improved soil water content, with the highest increase observed under PM(93.3%). SR treatment had the most pronounced effect on soil enzyme activities, followed by PM and SM. The ranking of soil EMF was SR>PM>SM>CK. PM and SR treatments significantly increased spring wheat yield by 13.4% and 18.2%, respectively. Overall, straw residue mulching and incorporation proved to be the most suitable mulching practice for the region.

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