| .耕作方式与秸秆还田对表层土壤活性有机碳组分与产量的短期影响[J].农业环境科学学报,2013,32(4):. |
| 耕作方式与秸秆还田对表层土壤活性有机碳组分与产量的短期影响 |
| Short-term Effects of Tillage Practices and Wheat-straw Returned to the Field on Topsoil Labile Organic Carbon Fractions and Yields in Central China |
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| DOI：10.11654/jaes.2013.04.012 |
| 中文关键词: 秸秆还田 土壤活性有机碳 碳库管理指数 |
| 英文关键词: wheat straw returned to the field soil organic carbon carbon pool management index |
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| 中文摘要: |
| 为探明耕作方式和小麦秸秆还田对稻田表层（0~20 cm）土壤活性有机碳（LOC）、碳库管理指数（CPMI）和作物产量的短期影响，于2011年在湖北省随州市均川镇，设置了免耕（NT）和翻耕（PT）两种耕作方式以及6000（SR3）、4000（SR2）、2000（SR1）、0 kg·hm-2（SR0） 4种还田量。结果表明：相对于翻耕，免耕显著提高水溶性有机碳（WSOC）23%~68%（P<0.000 1）、微生物生物量碳（MBC）21%~40%和易氧化态碳（EOC）10%~63%（P<0.000 1），但不影响颗粒态碳。相对于秸秆不还田处理（SR0），SR2和SR1显著提高WSOC 37%~74%（P<0.000 3）；EOC含量随还田量增加而增加。对CPMI的影响，耕作处理表现为免耕>翻耕，秸秆还田处理为SR3>SR2>SR1>SR0。处理SR3、SR2和SR1比SR0分别使产量提高了7.7%~16%、17%~35%和23%~28%。线性相关分析表明，WSOC与产量有极显著相关性（P＜0.01），表明土壤水溶性碳对短期土壤管理措施的改变反应敏感。 |
| 英文摘要: |
| Conservation management practices, such as no-tillage（NT） or crop residue returning, alter soil organic carbon（C） lability, thus affecting soil quality. However, inconsistent effects of conservation management practices on soil labile organic C have been commonly reported. Therefore, a field experiment was conducted to study the effects of tillage practices and wheat-straw returned to the field on soil liable organic carbon（LOC）, carbon pool management index（CPMI） and rice grain yield at the Junchuan in Hubei Province of China. Treatments were established following a split-plot design of a randomized complete block with tillage practices [plough tillage（PT） and no-tillage（NT）]as the main plot and wheat straw returning level [6000 kg·hm-2（SR3）, 4000 kg·hm-2（SR2）, 2000 kg·hm-2（SR1） and 0 kg·hm-2（SR0）] as the sub-plot treatment. The results indicated that, compared with PT, NT significantly increased the content of soil water-soluble organic carbon（WSOC） by 23%~68%（P<0.000 1）, microbial biomass carbon（MBC） by 21%~40%, easily oxidizable carbon（EOC） by 10%~63%（P<0.000 1），but didn′t have remarkable effect on the particulate organic carbon（POC）. The SR2 and SR1 significantly increased the WSOC contents by 37%~74% compared to SR0（P<0.000 3）. EOC contents increased with increasing amounts of wheat straw returning. NT significantly increased CPMI compared to PT. The effects of wheat straw returning on CPMI followed the order：SR3>SR2>SR1>SR0. SR3, SR2 and SR1 increased rice grain yield by 7.7%~16%,17%~35% and 23%~28% respectively. Correlation analysis revealed that WSOC could be a more sensitive indicator responsing to the changes of soil management practices than other indices in short-term. |
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