Mixed Inorganic and Organic Nitrogen Addition Enhanced Extracellular Enzymatic Activities in a Subtropical Forest Soil in East China
Mixed Inorganic and Organic Nitrogen Addition Enhanced Extracellular Enzymatic Activities in a Subtropical Forest Soil in East China
复制标题
混合无机和有机氮添加增强华东亚热带森林土壤细胞外酶活性
DOI：
10.1007/s11270-010-0530-x
复制
发表时间：
2011-03-01
影响因子：
2.9
通讯作者：
Tian, Xingjun
中科院分区：
文献类型：
--
作者：
Guo, Peng;Wang, Congyan;Tian, Xingjun
迄今为止，许多研究已采用单一类型的氮（N）添加方法来报告氮沉降对森林生态系统凋落物分解过程中土壤细胞外酶活性（EEA）的影响。由于自然大气氮沉降是一组复杂的化合物，包括无机氮和有机氮，因此研究土壤EEA对各种混合氮肥的响应至关重要。在中国东部紫金山的一个亚热带林地，从2008年到2009年，每月向土壤中添加不同无机氮和有机氮比例的各种氮肥。每4个月从施氮地块和对照地块中收获样品。随后，对六个 EEA 进行了分析。同时还进行了实验室实验。田间和实验室实验均表明，不同的混合氮肥对土壤EEA有不同的影响。大多数土壤EEA混合施氮肥的加速作用大于单一施氮肥的加速作用。大多数土壤胞外酶在混合氮肥下表现出最高活性，无机氮与有机氮的比例为3:7。这些结果表明，氮的类型和无机氮与有机氮的比例是控制土壤EEA的重要因素，其中无机氮与有机氮的3:7比例可能是土壤EEA的最佳比例。
To date, numerous studies have employed single type nitrogen (N) addition methods in reporting influences of N deposition on soil extracellular enzymatic activities (EEA) during litter decomposition in forest ecosystems. As natural atmospheric N deposition is a set of complex compounds including inorganic N and organic N, it is essential for investigating responses of soil EEA to various mixed N fertilization. In a subtropical forest stand in Zijin Mountain, East China, various N fertilizers with different inorganic N and organic N ratios were added to soils monthly from 2008 to 2009. Samples were harvested from N fertilized and control plots every 4 months. Subsequently, six EEA were assayed. A laboratory experiment was also conducted simultaneously. Both field and laboratory experiments showed that various mixed N fertilizations revealed different influences on soil EEA. Acceleration of most soil EEA by mixed N fertilization was greater than that of single N fertilization. The majority of soil extracellular enzymes exhibited the highest activities under mixed N fertilization, with the ratio of inorganic N to organic N at 3:7. These results suggested that N type and ratio of inorganic N and organic N were important factors controlling soil EEA, and the 3:7 ratio of inorganic N and organic N may be the optimum for soil EEA.