不同植茶年限土壤碳氮养分及胞外酶对干旱胁迫的响应

发布时间：2018-03-14 09:24

本文选题：茶园土壤　切入点：植茶年限　出处：《生态学报》2017年02期 　论文类型：期刊论文

【摘要】：全球气候变暖导致的夏季干旱事件频发影响茶园生态系统生产力,而茶叶是我国南方主要的经济作物,因此研究干旱条件下不同植茶年限茶园土壤养分、生态酶活性及微生物生态变化具有重要意义。选取杭州市余杭区径山茶园3种不同植茶年限(10a、30a和50a)土壤和邻近的荒土为研究对象,研究不同水分(干旱组30%WFPS(water-filled pore space)和对照组55% WFPS)处理前、第7天和第14天的土壤碳氮养分(可溶性有机碳DOC,总有机碳TOC,微生物碳MBC,微生物氮MBN,铵态氮NH_4-N,硝态氮NO_3-N)和胞外酶活性(涉碳胞外酶:β-N萄糖苷酶BG,涉氮胞外酶:N-乙酰氨基葡萄糖苷酶+亮氨酸氨基肽酶NAG+LAP)变化探讨不同水分对不同植茶年限土壤生态系统的影响。结果表明,茶园土壤碳库及涉碳、涉氮胞外酶活性随着植茶年限增加先升高后降低(30a最高);土壤氮库养分随着植茶年限增加而增加。干旱处理增加了土壤TOC、NH_4-N、NO_3-N含量而降低了土壤MBC含量、BG和NAG+LAP活性。处理前后植茶年限30a土壤DOC、MBN、NO_3-N和涉碳、涉氮胞外酶含量最高且其干旱组土壤DOC、TOC、MBC、MBN含量与对照组比变幅相对较小,可推断植茶年限30a左右的土壤微生态环境丰富,对外界环境变化的抵抗力较强。
[Abstract]:The summer drought events caused by global warming affect the productivity of tea garden ecosystem, and tea is the main cash crop in southern China. The ecological enzyme activity and microbial ecological change are of great significance. Three different tea planting years (10a ~ 30a and 50a) of tea plantation in Jingshan tea garden in Yuhang District of Hangzhou City were selected as the research objects. Before treatment with different water (30 WFPS waterfilled pore space) and control group (55% WFS), Soil carbon and nitrogen nutrients (soluble organic carbon DOC, total organic carbon TOC, microbial carbon MBC, microbial nitrogen MBN, ammonium nitrogen NH 4-N, nitrate nitrogen no 3-N) and extracellular enzyme activity (carbohydrate extracellular enzyme: 尾 -N glucosidase, 尾 -N glucosidase BG). The effects of different moisture on soil ecosystem with different years of tea planting were studied. Tea garden soil carbon pool and carbon, The activity of extracellular enzyme increased first and then decreased with the increase of tea planting time, and the nutrient of soil nitrogen pool increased with the increase of tea planting time. Drought treatment increased the content of soil TOCU NH 4-N no 3-N, but decreased the activities of MBC content BG and NAG LAP in soil. Soil DOC MBN no _ 3-N and C ~ (2 +) were grown for 30 years before and after tea treatment. The highest content of extracellular enzyme involved in nitrogen and the smaller change of MBN content in soil of drought group compared with the control group, it can be inferred that the soil microecological environment with tea planting life of about 30 years is rich, and the resistance to the change of external environment is stronger.
【作者单位】：浙江大学环境与资源学院环境保护研究所;
【基金】：高等学校博士学科点专项科研基金资助项目(20130101110127) 水体污染控制与治理科技重大专项资助项目(2014ZX07101-012)
【分类号】：S158;S154.2

【参考文献】