辽东山区次生林林窗大小对土壤微生物量碳、氮、磷的影响

生态学杂志

辽东山区次生林林窗大小对土壤微生物量碳、氮、磷的影响

肖建强^1,2,3,张维维^1,2,3,于立忠^1,2,杨凯^1,2*#br#

（¹中国科学院森林生态与管理重点实验室（沈阳应用生态研究所），沈阳 110016；^2中国科学院清原森林生态系统观测研究站，沈阳 110016； ^3中国科学院大学，北京 100049）

出版日期:2017-11-10 发布日期:2017-11-10

Effects of gap size on soil microbial biomass carbon, nitrogen and phosphorus in a secondary forest in a montane region of eastern Liaoning Province, China.

XIAO Jian-qiang^1,2,3, ZHANG Wei-wei^1,2,3, YU Li-zhong^1,2, YANG Kai^1,2*#br#

(¹Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; ^2Qingyuan Forest CERN, Chinese Academy of Sciences, Shenyang 110016， China; ³University of Chinese Academy of Sciences, Beijing 100049, China).

Online:2017-11-10 Published:2017-11-10

摘要/Abstract

摘要： 林窗干扰是次生林更新和演替过程的重要干扰类型，影响土壤的养分供应。为明确温带次生林林窗大小对土壤养分循环过程的影响，以辽东山区典型次生林内形成时间为6年的大、中、小（90～670 m²）人工林窗为研究对象，测定了生长季不同大小林窗内0～20 cm土层土壤微生物量碳、氮、磷。结果表明：与对照样地相比，大、中、小林窗0～10和10～20 cm土层土壤微生物量碳、微生物量磷、微生物量碳/全碳和微生物量磷/全磷无显著差异，且不同大小林窗间土壤微生物量碳、氮、磷以及微生物量碳/全碳、微生物量氮/全氮、微生物量磷/全磷均无显著差异。与对照样地相比，中林窗（290 m²）10～20 cm土层土壤微生物量氮和微生物量氮/全氮显著升高，表明中林窗促进了10～20 cm土层土壤氮素的循环和有效氮素的供应。

关键词: 分子量分级, 水质, 溶解性有机质, 液相-总有机碳-有机氮检测

Abstract: Gap disturbance plays an important role in the processes of regeneration and succession of secondary forests, and influences the capability of soil nutrient supply. To indicate the effects of gap size on the processes of nutrient cycling in soil, we measured soil microbial biomass carbon, nitrogen and phosphorus during the peak growing season at the 0-20 cm depth in large, medium and small gaps (90-670 m²) formed 6 years ago in the secondary forest in a montane region of eastern Liaoning Province, China. The results showed that compared with the control soil (i.e., the soil in the understory), there were no significant differences in microbial biomass carbon, microbial biomass phosphorus, the ratios of microbial biomass carbon to total carbon and microbial biomass phosphorus to total phosphorus in the three sizes of gaps at the soil depths of 0-10 and 10-20 cm. In addition, there were also no significant differences in microbial biomass carbon, nitrogen, phosphorus, the ratios of microbial biomass carbon to total carbon, microbial biomass nitrogen to total nitrogen and microbial biomass phosphorus to total phosphorus among the three gap sizes. In comparison with the control soil, microbial biomass nitrogen and the ratio of microbial biomass nitrogen to total nitrogen were significantly higher in the medium gaps with the size of 290 m² in the 10-20 cm soil layer, indicating the increase of cycling and availability of soil nitrogen in the medium gaps.

Key words: water quality, dissolved organic matter, liquid chromatography-organic carbon detection-organic nitrogen detection, molecular weight fraction

肖建强1,2,3,张维维1,2,3,于立忠1,2,杨凯1,2*. 辽东山区次生林林窗大小对土壤微生物量碳、氮、磷的影响[J]. 生态学杂志.

XIAO Jian-qiang1,2,3, ZHANG Wei-wei1,2,3, YU Li-zhong1,2, YANG Kai1,2*. Effects of gap size on soil microbial biomass carbon, nitrogen and phosphorus in a secondary forest in a montane region of eastern Liaoning Province, China.[J]. cje.

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