间伐对长江滩地杨树人工林土壤有效氮素的影响

doi:10.3969/j.issn.1000-2006.2013.04.009

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南京林业大学学报（自然科学版） ›› 2013, Vol. 37 ›› Issue (04): 45-50.doi: 10.3969/j.issn.1000-2006.2013.04.009

间伐对长江滩地杨树人工林土壤有效氮素的影响

囤兴建¹,曲宏辉²,田野¹,方升佐^1*,徐锡增¹

1.南京林业大学森林资源与环境学院,江苏南京 210037;
2.烟台市林业局,山东烟台 264000

出版日期:2013-08-18 发布日期:2013-08-18
基金资助:
收稿日期:2013-01-03 修回日期:2013-03-26
基金项目:国家重点基础研究发展计划(2012CB416904); 江苏省普通高校研究生科研创新基金(CXZZ11_0535)
第一作者:囤兴建,博士生。*通信作者:方升佐,教授。E-mail: fangsz@njfu.edu.cn。
引文格式:囤兴建,曲宏辉,田野,等. 间伐对长江滩地杨树人工林土壤有效氮素的影响[J]. 南京林业大学学报:自然科学版,2013,37(4):45-50.

Effects of thinning treatments on soil available nitrogen of the poplar plantations in flooding land of Yangtze River

DUN Xingjian¹, QU Honghui², TIAN Ye¹, FANG Shengzuo^1*, XU Xizeng¹

1.College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China;
2. Yantai Bureau of Forestry, Yantai 264000, China

Online:2013-08-18 Published:2013-08-18

摘要/Abstract

摘要： 以南京长江滩地6年生杨树人工林为研究对象,设计了5种间伐处理(对照、30%、40%、50%强度的下层伐和50%强度的机械伐),分析了不同间伐处理对杨树人工林土壤无机氮、土壤水溶性有机氮(DON)和土壤微生物量氮(SMBN)含量的影响以及这三者之间的关系。结果表明:不同间伐处理对土壤无机氮素含量、土壤微生物量氮和土壤水溶性有机氮含量均有显著影响,且50%强度的下层伐和机械伐处理下三者的含量较高,其含量随季节的动态变化均呈先上升后下降的动态变化; 不同间伐处理下的3个层次中土壤有效氮素含量均表现出明显的表聚性,0～5 cm土层的有效氮素含量明显较高; 土壤有效氮素之间的相关性不显著,仅SMBN与DON、土壤硝态氮呈正相关关系。

Abstract: In order to improve the quality of the poplar plantations, the 6-year-old poplar plantations located in the Nanjing beach of Yangtze River were chosen to study thinning effects. Five thinning treatments(contrast, 30% intensity of the lower thinning, 40% intensity of the lower thinning, 50% intensity of the lower thinning and 50% intensity of the mechanical thinning)were designed in this experiment. The effects of soil available nitrogen supply, including inorganic nitrogen, DON(soil dissolved organic nitrogen)and SMBN(soil microbial biomass nitrogen)under different thinning treatments were investigated. The results showed that:(1)Soil available nitrogen was significantly affected by thinning treatments and the contents of available nitrogen, DON and SMBN were the highest in the treatments of 50% thinning intensities.(2)The contents of inorganic nitrogen, DON and SMBN showed a seasonal dynamic, and the highest contents of soil available nitrogen were in August.(3)The surface gathering of the available nitrogen was found for all the treatments, and the content at the soil depth of 0-5 cm was significantly higher than that of other two soil depths.(4)The correlation analysis showed a poor correlation among the contents of different types of soil available nitrogen within the experimental period. However, a significant and positive correlation between SMBN and DON as well as soil nitrate nitrogen was found during August. Results from the present study would provide a theoretical basis for the cultivating poplar large-diameter timber.

中图分类号:

S714

囤兴建,曲宏辉,田野,等. 间伐对长江滩地杨树人工林土壤有效氮素的影响[J]. 南京林业大学学报（自然科学版）, 2013, 37(04): 45-50.

DUN Xingjian, QU Honghui, TIAN Ye, FANG Shengzuo, XU Xizeng. Effects of thinning treatments on soil available nitrogen of the poplar plantations in flooding land of Yangtze River[J].Journal of Nanjing Forestry University (Natural Science Edition), 2013, 37(04): 45-50.DOI: 10.3969/j.issn.1000-2006.2013.04.009.

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间伐对长江滩地杨树人工林土壤有效氮素的影响

Effects of thinning treatments on soil available nitrogen of the poplar plantations in flooding land of Yangtze River

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