| 李茴,赵杏,杨京平,钟一铭,王小鹏.高温与降雨对不同茶龄土壤碳氮养分及胞外酶活性的影响[J].农业环境科学学报,2017,36(3):557-565. |
| 高温与降雨对不同茶龄土壤碳氮养分及胞外酶活性的影响 |
| Effects of extreme warming and rainfall on carbon and nitrogen nutrients status and enzyme activities in tea garden soils with different planting ages |
| 投稿时间：2016-10-10 |
| DOI：10.11654/jaes.2016-1287 |
| 中文关键词: 茶园土壤 茶龄 土壤养分 胞外酶活性 极端气候 |
| 英文关键词: tea orchards cultivation age soil nutrients extracellular enzyme extreme climate |
| 基金项目:高等学校博士学科点专项科研基金项目（20130101110127）；国家水体污染控制与治理科技重大专项（2014ZX07101-012） |
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| 中文摘要: |
| 通过高温（35、40℃）和降雨处理，对三种不同茶龄包括10年（Y10）、30年（Y30）和50年（Y50）的茶园土壤和茶园邻近荒地土壤（Y0）进行研究，分析土壤碳氮含量、胞外酶活性的动态变化，以明确不同茶龄土壤的碳、氮养分及酶活性对极端高温和降雨气候条件下的响应。结果表明，高温处理对土壤碳、氮库养分和涉碳、涉氮胞外酶活性有显著性影响，高温（35℃）处理降低了土壤有机碳、铵态氮、硝态氮含量，降低土壤微生物含量、土壤涉碳胞外酶活性，但是会增加涉氮胞外酶活性。极端高温（40℃）会显著降低土壤中碳氮养分含量以及涉碳、涉氮胞外酶活性，从而改变土壤碳氮循环过程和速率。极端高温处理之后，模拟降雨对土壤中微生物量碳以及胞外酶活性有恢复作用，但是对其他养分指标没有显著影响。整个处理过程中，茶龄为Y30的土壤表现出更高的碳氮养分含量以及酶活性，对极端高温及降雨的环境变异抵抗力、土壤稳定性优于其他茶龄土壤。 |
| 英文摘要: |
| In this paper, we investigate the effects of high temperature and rainfall on soil carbon and nitrogen variations and enzyme activities, by conducting experiments on different tea soils at cultivation ages of 0, 10, 30, and 50 years. The result indicated that under 35℃ treatment condition, the soil total organic carbon, ammonium nitrogen, nitrate nitrogen, microbial carbon contents, and the activity of extracellular enzymes related to soil carbon decreased while the extracellular enzymes related to soil nitrogen increased. 40℃ treatment can significantly reduce the content of carbon and nitrogen in soil and the activity of extracellular enzymes related to carbon and nitrogen of soil. Afterwards, the following simulated rainfall presented a positive effect on the recovery of soil microbial biomass carbon and extracellular enzyme activity, but there was no significant effect on other nutrient indexes. Above all, the tea soil under cultivation age 30 years exhibited higher nutrient content of carbon, nitrogen and enzyme activity, meaning that the soil ecosystem stability and the resistance ability to extreme high temperature and rainfall variation are better than other soil cultivation ages. |
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