| 青海东部地膜覆盖对土壤固碳能力和肥力水平的影响 |
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| 引用本文： | 杨凯,胡庆兰,王金贵. 青海东部地膜覆盖对土壤固碳能力和肥力水平的影响[J]. 中国农学通报, 2021, 37(33): 105-111. DOI: 10.11924/j.issn.1000-6850.casb2021-0007 |
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| 作者姓名： | 杨凯 胡庆兰 王金贵 |
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| 作者单位： | 1.青海大学农牧学院,西宁 810016;2.省部共建三江源生态与高原农牧业国家重点实验室,西宁 810016 |
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| 基金项目： | 青海省自然科学基金项目“青海东部农田生态系统地膜覆盖的土壤生态效应”(2018-ZJ-724);青海省重大科技专项“青海农区化肥农药减量增效综合配套技术研究与集成应用”(2019-NK-A11) |
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| 摘 要： | 为探究青海东部地区地膜覆盖条件下单施化肥对土壤固碳能力和土壤肥力的影响,为实现该地区地膜覆盖种植方式生产的可持续发展提供理论依据。通过对青海东部地区旱地玉米农田连续3年田间覆膜试验,研究地膜覆盖条件下单施化肥栽培模式对耕层(0~20 cm)土壤有机碳(SOC)、活性有机碳(LOC)、碳库管理指数(CMI)、可提取腐殖质碳(CHE)、胡敏酸碳(CHA)和富里酸碳(CFA)的影响。结果表明：覆膜条件下单施化肥栽培模式的SOC、LOC和CMI均小于露地对照;CHE、CHA和CFA均随着种植年限的增加而有所增加,但其增加程度总体上均小于露地对照。随着种植年限的增加,至2020年地膜覆盖土壤LOC/SOC值比试验开始前降低了4.97%,而露地对照则升高了1.11%;同时地膜覆盖有机碳氧化稳定系数(KOS)均高于露地对照;土壤CHA/CFA值和PQ值均大于露地对照。单施化肥条件下连续地膜覆盖栽培模式使土壤固碳能力有所下降,土壤有机碳趋于稳定而不利于被生物利用;使土壤肥力下降,土壤质量向不良方向发展,长期以往可能会对该地区作物产量的稳定性和持续生产产生不利的影响。
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| 关 键 词： | 土壤 固碳能力 肥力水平 有机碳 腐殖质 地膜覆盖 |
| 收稿时间： | 2021-01-05 |
Effects of Plastic Film Mulching on Soil Carbon Fixation Capacity and Fertility Level in Eastern Qinghai |
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| Yang Kai,Hu Qinglan,Wang Jingui. Effects of Plastic Film Mulching on Soil Carbon Fixation Capacity and Fertility Level in Eastern Qinghai[J]. Chinese Agricultural Science Bulletin, 2021, 37(33): 105-111. DOI: 10.11924/j.issn.1000-6850.casb2021-0007 |
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| Authors: | Yang Kai Hu Qinglan Wang Jingui |
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| Affiliation: | 1.College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016;2.State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016 |
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| Abstract: | To explore the effect of single application of chemical fertilizer on soil carbon fixation capacity and soil fertility under plastic film mulching in eastern Qinghai, and provide a theoretical basis for the sustainable development of plastic film mulching cultivation mode in this area, the effects of single application of chemical fertilizer under film mulching on soil organic carbon (SOC), labile organic carbon (LOC), carbon pool management index (CMI), extractable humus carbon (CHE), humic acid carbon (CHA) and fulvic acid carbon (CFA) in the cultivated layer (0-20 cm) were studied in dryland maize field for three consecutive years. The results showed that SOC, LOC and CMI of the treatment group were lower than those of the open field control group; CHE, CHA and CFA increased with the increase of planting years, but the increase degree was generally less than that of the open field control. With the increase of planting years, by 2020, the LOC/SOC value of plastic film mulched soil decreased by 4.97%, while that of open field control increased by 1.11%; meanwhile, the organic carbon oxidation stability coefficient (KOS) of plastic film mulching group was higher than that of open field control; the CHA/CFA value and PQ value of soil were higher than that of open field control. Under the single fertilizer application, the continuous plastic film mulching cultivation mode could reduce soil carbon fixation capacity and and soil organic carbon tends to be stable, which is not conducive to biological utilization and could reduce the soil fertility and degrade the soil quality, causing adverse effects on the stability of crop yield and sustainable production in the long run． |
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| Keywords: | soil carbon fixation capacity fertility level organic carbon humus plastic film mulching |
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