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| 喀斯特峰丛洼地土壤有机碳和氮素空间变异特征 | |
| 引用本文： | 吴海勇,曾馥平,宋同清,彭晚霞,黎星辉,欧阳资文.喀斯特峰丛洼地土壤有机碳和氮素空间变异特征[J].植物营养与肥料学报,2009,15(5):1029-1036. |
| 作者姓名： | 吴海勇 曾馥平 宋同清 彭晚霞 黎星辉 欧阳资文 |
| 作者单位： | 1.南京农业大学茶学研究所,江苏南京 210095; |
| 基金项目： | 中国科学院西部行动计划，国家科技支撑计划，国家重点基础研究发展规划(973计划) |
| 摘 要： | 本项试验在喀斯特典型峰丛洼地选择3个生态功能区，运用经典统计学和地统计学方法研究了土壤有机碳、全氮及碳氮比的空间变异特征。结果表明，随着生态系统由人工林(Ⅰ)次生林(Ⅱ) 原生林(Ⅲ)顺向演替，土壤有机碳、全氮和碳氮比平均值均呈现增加趋势，变异系数均在10.40％～80.94％之间，存在中等强度的变异性。人工林和原生林的土壤有机碳和全氮及人工林的碳氮比的块金值/基台值均＜25%，具有强烈的空间相关性；原生林碳氮比和次生林的3个土壤性质指标的块金值/基台值在32.6％～41.7％之间，具有中等的空间相关性；人工林各指标的变程明显大于次生林和原始林。Kriging插值结果表明，3个区域内有机碳和全氮的空间分布均具有显著的相似性，碳氮比变化则较不规则；人工林和原生林土壤有机碳、全氮含量呈片状平缓变化分布，次生林土壤有机碳、全氮含量及碳氮比呈支离破碎的斑块状分布。高度异质性的小生境决定了土壤有机碳、全氮和碳氮比的空间结构和格局，而受重度人类活动干扰的人工林和未受干扰的原生林空间异质性较次生林降低。 |
| 关 键 词： | 喀斯特 峰丛洼地 空间变异 有机碳 全氮 碳氮比 |
| 收稿时间： | 2008-9-23 |
Spatial variations of soil organic carbon and nitrogen in peak-cluster depression areas of Karst Region |
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| WU Hai-yong,ZENG Fu-ping,SONG Tong-qing,PENG Wan-xia,LI Xing-hui,OUYANG Zi-wen.Spatial variations of soil organic carbon and nitrogen in peak-cluster depression areas of Karst Region[J].Plant Nutrition and Fertilizer Science,2009,15(5):1029-1036. | |
| Authors: | WU Hai-yong ZENG Fu-ping SONG Tong-qing PENG Wan-xia LI Xing-hui OUYANG Zi-wen |
| Affiliation: | 1.Tea Institute,Nanjing Agricultural University,Nanjing,Jiangsu 210095,China; 2 Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha,Hunan 410125,China; 3 Soil and Fertilizer Institute of Hunan Province,Changsha,Hunan 410125,China; 4 College of Bioscience and Biotechnology,Hunan Agricultural University,Changsha,Hunan 410128,China; |
| Abstract: | Classical statistics and geo-statistics were used to analyze the spatial variations of soil organic carbon (SOC), total nitrogen (TN) and C/N in three ecological areas of a peak-cluster depression with the Karst topography. The results show that SOC, TN and C/N increase with the succession level from artificial forest (I) to secondary forest (II), to primary forest (III). CV. of SOC, TN and C/N vary from 10.40% to 80.94% which show medium variations. Nugget/Sill of SOC and TN in I and III, and Nugget/Sill of C/N in I are less than 25%, which indicates there are high spatial autocorrelation. Nugget/Sill of SOC and TN and C/N in II, and Nugget/Sill of C/N in III are in the range of 32.6% and 41.7%, which implies the medium spatial autocorrelation. The distances of SOC, TN and C/N in I are longer than those in II and III. Kriged maps show that the spatial distribution of SOC is similar to that of TN in the three ecological areas. However, the spatial distribution of C/N seems irregular. There are sliced smooth distributions of SOC and TN in I and III, while there are fragmentized distributions of SOC, TN and C/N in II. The spatial distributions of SOC, TN and C/N are determined by the high heterogeneity of environment, and spatial heterogeneities in human badly disturbed I and non-disturbed III become lower than that in II. |
| Keywords: | Karst peak-cluster depression spatial variation soil organic carbon total nitrogen C/N |
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