地膜覆蓋對黃土高原旱作春玉米田土壤碳氮組分的影響
[Abstract]:Based on the two-year field experiment, the effects of plastic film mulching on soil organic carbon, total nitrogen and their components in dry spring maize fields were studied. The experiments included three treatments: plastic film mulching corn field, non-mulching corn field and bare land recreation. The contents of organic carbon, total nitrogen, granular organic carbon and nitrogen, potential mineralized carbon and microbial biomass carbon and nitrogen in 0-40cm soil layer were determined by stratification. The results showed that there was no significant difference in soil organic carbon and total nitrogen contents among the treatments in 0-40cm soil layer. Compared with no mulching, the proportion of organic carbon and nitrogen in 0-40cm soil layer decreased by 29.0%, 33.3%, 29.9% and 35.7%, respectively. The potential mineralized carbon and its proportion in the 0-10cm soil layer decreased by 17.8% and 16.1%, respectively, and there was no significant difference in the potential mineralized nitrogen and microbial biomass carbon and their proportion. However, the microbial biomass nitrogen content and the proportion of microbial biomass nitrogen increased by 10.6% and 10.5% (p0.05) respectively in 0-10cm soil layer under plastic film mulching compared with the non-mulching treatment. The potential mineralizable carbon and nitrogen of 0-40cm soil layer increased by 12.8% and 14.7% respectively, and that of plastic film mulching treatment increased by 7.8% and 6.5% (p0.05), respectively, compared with that of bare land recreation, and that of non-mulching treatment increased by 12.8% and 14.7%, respectively. But planting maize reduced the microbial biomass carbon and nitrogen content and its proportion. The potential mineralizable carbon-nitrogen and microbial biomass carbon-nitrogen were not significantly affected by 0-40cm soil mulching or not. In general, plastic film mulching could improve microbial biomass nitrogen and its proportion to a certain extent, but significantly reduce the content and proportion of activated carbon and nitrogen, which was not conducive to long-term soil carbon and nitrogen fixation.
【作者單位】: 西北大學(xué)城市與環(huán)境學(xué)院;
【基金】:國家自然科學(xué)基金項目(31570440,31270484) 西北大學(xué)研究生自主創(chuàng)新項目(YZZ13006)
【分類號】:S153.6
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