| 赵丹丹,王俊,付鑫.长期定位施肥对旱作农田土壤有机碳及其组分的影响[J].干旱地区农业研究,2017,35(1):97~102 |
| 长期定位施肥对旱作农田土壤有机碳及其组分的影响 |
| Effect of long-term fertilization on soil organic carbon and its fractions under dryland farming system |
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| DOI：10.7606/j.issn.1000-7601.2017.01.15 |
| 中文关键词: 长期施肥 土壤有机碳 微生物量碳 潜在矿化碳 碳库管理指数 |
| 英文关键词:Long-term fertilization soil organic carbon potential carbon mineralization microbial biomass carbon carbon management index |
| 基金项目:国家自然科学基金(31270484，31570440) |
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| 中文摘要: |
| 基于田间定位试验，研究了长期施肥对旱作冬小麦农田土壤有机碳及其组分的影响，试验包括4个处理：不施肥（CK）、氮磷配施（NP）、化肥与有机肥配施（NPM）以及长期休闲地（BL）。结果表明:长期持续施肥30年后，在 0～30 cm土层，NPM处理土壤有机碳、微生物量碳、潜在矿化碳以及碳库管理指数分别较CK提高了42.2%、55.9%、40.9%和40.0%（P<0.05），NP处理土壤有机碳和微生物量碳与CK差异不显著,潜在矿化碳和碳库管理指数分别提高了29.1%和20.0%（P<0.05），施肥对两种活性有机碳含量的影响在15～30 cm土层表现更加显著；与种植作物相比，长期休闲显著降低了土壤潜在矿化碳含量，BL处理较CK降低了20.5%（P<0.05）。相关性分析表明，土壤有机碳、潜在矿化碳、微生物量碳以及碳库管理指数两两之间存在着显著的相关性，且有机碳组分含量与土壤有机碳含量在处理间变化具有一致性(除NP处理外)，两种活性有机碳相对含量在各处理间差异均不显著。总的来说，长期持续施入有机肥能够有效地增加旱作农田土壤有机碳同时增加其活性组分，有助于培肥地力和土壤固碳。 |
| 英文摘要: |
| A long-term winter wheat field experiment was conducted to detect the effect of long-term fertilization on soil organic carbon and its active fractions. Four treatments were performed as control treatment (CK), nitrogen and phosphorus combined fertilization (NP), nitrogen, phosphorus and manure combined fertilization (NPM) and bare land without fertilization and cropping (BL). The results showed that the contents of soil organic carbon content, microbial biomass carbon content, potential mineralized carbon and carbon management index at 0～30 cm soil layers were improved in NPM than in CK after 30-year continuous fertilization, being 42.2%、55.9%、40.9% and 40.0% higher, respectively. No significant difference in soil organic carbon and microbial biomass carbon were found between NP and CK, howerver, the potential mineralized carbon content and carbon management index were significantly higher in NP than in CK. The effect of long term fertilization on soil active organic carbon fractions was more obvious at 15～30 cm soil layers than at 0～15 cm layers. No cropping reduced the contents of soil organic carbon and its fractions significantly. Soil carbon potential mineralization was lower by 20.5% in BL than in CK, respectively. Correlation analysis showed that soil organic carbon, potential mineralization carbon, microbial biomass carbon and carbon management index correlated with each other significantly. Soil organic carbon changed in agreement with its fractions for all treatments except for NP, and the relative contents of two active organic carbon and its potential mineralization ratio of microbial biomass carbon were not significant among treatments. In general, continuous long-term manure addition can effectively increase soil organic carbon and its active fractions, contributing to soil fertility and carbon sequestration under dryland farming systems. |
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