湘中丘陵区不同土地利用方式土壤水溶性有机碳含量

生态学杂志

湘中丘陵区不同土地利用方式土壤水溶性有机碳含量

张仕吉¹,项文化^1,2**,孙伟军¹,方晰^1,2

（¹中南林业科技大学生命科学与技术学院，长沙 410004； ^2南方林业生态应用技术国家工程实验室，长沙 410004）

出版日期:2014-08-10 发布日期:2014-08-10

Soil dissolved organic carbon concentration under different land-use patterns in a hilly area of central Hunan Province, China.

ZHANG Shi-ji¹, XIANG Wen-hua^1,2**, SUN Wei-jun¹, FANG Xi^1,2

(¹College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China; ² National Engineering Laboratory of South Forestry Ecology Applicable Technologies, Changsha 410004, China)

Online:2014-08-10 Published:2014-08-10

摘要/Abstract

摘要：

为了解土地利用方式对土壤有机碳库的影响，研究了湘中丘陵区6种土地利用方式（石栎+青冈次生林、杉木人工林、毛竹林、苗圃、农用旱地、水田）土壤水溶性有机碳（DOC）含量及其季节动态，分析了土壤DOC含量与土壤自然含水率、碳（C）、氮（N）含量之间的关系。结果表明：土壤DOC含量随土壤深度增加而下降，秋季土层之间差异最小，土壤DOC分配比例随土壤深度增加而增大；不同土地利用方式土壤DOC含量差异显著，与石栎+青冈次生林相比，毛竹林、杉木人工林、水田、农用旱地、苗圃依次下降了10%～12%、11%～12%、13%～19%、18%～25%和37%～42%，夏季不同土地利用方式之间差异最大。不同土地利用方式土壤DOC含量季节变化明显，均表现为：春、夏、冬季较高，秋季最低，秋季与春、夏、冬季之间差异显著；土壤DOC含量与土壤自然含水率、TOC、MBC、ROC、MOC、全N、水解N含量呈显著或极显著正相关。可见，土地利用方式显著影响土壤DOC含量及其空间分布，次生林转变为人工林或农用地后，土壤DOC含量明显下降。

关键词: 形态多样性, 次南极电灯鱼, 椭圆傅里叶, 耳石

Abstract: In order to understand the effects of land-use patterns on soil organic carbon (SOC) pool, a study was conducted to examine the seasonal variation of soil dissolved organic carbon (DOC) and its correlation with soil moisture content, carbon (C) and nitrogen (N) concentrations in six adjacent land use types: (1) Lithocarpus glaber + Cyclobalanopsis glauca secondary forest, (2) Cunninghamia lanceolata plantation, (3) Phyllostachys edulis forest, (4) seedling nursery land, (5) slope cropland, and (6) paddy field in a hilly area of central Hunan, China. The results showed that DOC concentrations decreased with soil depth and with the minimum difference of DOC concentrations between soils layers occurring in autumn, while the proportion of DOC increased with increasing the soil depth. Soil DOC concentrations were significantly different among the land use types. Soil DOC concentrations decreased by 10%-12%, 11%-12%, 13%-19%, 18%-25% and 37%-42% in P. edulis forest, C. lanceolata plantation, paddy field, slope cropland and seedling nursery land, respectively, as compared with L. glaber + C. glauca secondary forest. The differences in DOC concentration among different land use types were maximum in summer. Seasonal variations in DOC concentration were considerable but a similar change pattern was found in the six land use types. Soil DOC concentrations were significantly higher in spring, summer and winter than in autumn. Positive correlations were found between DOC concentrations and soil moisture content, TOC, MBC, ROC, MOC, total N, and available N. These results demonstrated that landuse patterns significantly affected soil DOC concentration and its spatial distribution. Soil DOC concentrations were significantly reduced when secondary forests were converted to plantations or agricultural lands.

Key words: Electrona carlsbergi, morphological diversity, otolith, elliptical Fourier analysis

张仕吉1,项文化1,2**,孙伟军1,方晰1,2. 湘中丘陵区不同土地利用方式土壤水溶性有机碳含量[J]. 生态学杂志.

ZHANG Shi-ji1, XIANG Wen-hua1,2**, SUN Wei-jun1, FANG Xi1,2. Soil dissolved organic carbon concentration under different land-use patterns in a hilly area of central Hunan Province, China.[J]. cje.

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