南京林业大学学报(自然科学版) ›› 2014, Vol. 57 ›› Issue (01): 41-46.doi: 10.3969/j.issn.1000-2006.2014.01.008

• 研究论文 • 上一篇    下一篇

苏北沿海不同土地利用方式冬季土壤氮矿化速率比较

陈书信1,王国兵1,阮宏华1*,岳 臻1,徐长柏2,徐亚明2   

  1. 1.南京林业大学,江苏省林业生态工程重点实验室,江苏 南京 210037;
    2.江苏省东台市国有林场,江苏 东台 224200
  • 出版日期:2014-01-15 发布日期:2014-01-15
  • 基金资助:
    收稿日期:2013-02-20 修回日期:2013-06-15
    基金项目:国家林业公益性行业科研专项项目(201104006)
    第一作者:陈书信,硕士。*通信作者:阮宏华,教授。E-mail: hhruan@njfu.edu.cn。
    引文格式:陈书信,王国兵,阮宏华,等. 苏北沿海不同土地利用方式冬季土壤氮矿化速率比较[J]. 南京林业大学学报:自然科学版,2014,38(1):41-46.

Effect of different land uses on soil nitrogen mineralization in a coastal area of northern Jiangsu province, China, in winter

CHEN Shuxin1,WANG Guobing1,RUAN Honghua1*,YUE Zhen1,XU Changbai2,XU Yaming2   

  1. 1.Jiangsu Key Laboratory of Forestry Ecological Engineering,Nanjing Forestry University,Nanjing 210037,China;
    2.Dongtai City State Forest Farm of Jiangsu Province, Dongtai 224200,China
  • Online:2014-01-15 Published:2014-01-15

摘要: 土壤氮矿化速率常被作为生态系统中氮有效性和氮损失的指标。不同的土地利用方式可能影响土壤氮素的矿化、运输和植物的吸收与利用,因而造成土壤氮素循环过程的差异。该研究以苏北沿海地区杨树纯林、杨农复合、草地和农田等4种不同土地利用模式为研究对象,采用原位封顶法测定了土壤矿质氮含量的变化,分析了不同土地利用方式土壤氮净矿化速率的特征,以及土壤矿质氮与土壤微生物量氮(SMBN)、土壤水溶性有机氮(WSON)与土壤主要理化性质的相关关系。结果表明:不同土地利用方式土壤净矿化速率从大到小表现为杨树纯林>杨农复合>农田>草地; 土壤铵态氮(NH+4-N)与N矿化速率、SMBN、全氮有显著的正相关(p<0.05); 土壤硝态氮(NO-3-N)与SMBN、WSON、有机碳有极显著的正相关(p<0.01); NH4+-N、矿质总氮(TMN)与土壤C/N有极显著的负相关(p<0.01)。土壤矿质氮含量随土层的加深而显著减少; 在>10~25 cm土层,杨树纯林与杨农复合之间的土壤矿质氮含量差异显著(p<0.05)。研究结果表明土地利用方式的改变将影响土壤氮净矿化速率,森林转变为农田或农林复合结构后,氮在土壤中的储量和循环速率显著降低。

Abstract: In order to study the effect of different land use patterns on soil N mineralization, transportation, absorption and utilization of plant, and which lead to difference of soil nitrogen cycle, we selected four different land use patterns(i.e. poplar plantation, crop-poplar integrated system, meadow and cropland)in a coastal area of northern Jiangsu as the experimental sites. The variations of soil mineral N were determined by close-top incubation method. The soil net N mineralization rate, soil microbial biomass nitrogen(SMBN), water-soluble organic nitrogen(WSON)and soil physical and chemical properties were analyzed. The results showed that the net N mineralization rate decreased in order of poplar plantation, crop-poplar integrated system, cropland and meadow. Ammonium N was significantly positive correlated with microbial biomass nitrogen and total nitrogen, the nitrate N was significantly positive correlated with microbial biomass nitrogen, WSON and organic carbon, but the soil C/N was significantly negative correlated with ammonium N and total mineral nitrogen. The soil mineral nitrogen decreased with soil depth increasing. In 25-40 cm soil layers, the soil mineral nitrogen had significant difference with poplar plantation and crop-poplar integrated system. The results indicated that different land use patterns would affect soil net N mineralization rate, and the conversion of forest into cropland or crop-forest system could also alter the cycle rate of nitrogen significantly.

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