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中国沙漠 ›› 2020, Vol. 40 ›› Issue (6): 212-222.DOI: 10.7522/j.issn.1000-694X.2020.00081

• • 上一篇    下一篇

甘肃省中药材主产区陇西县土壤有机碳空间分布

唐亮1,2(), 何明珠1(), 白光祖1, 赵鹏善1, 任建新3, 许华1,2   

  1. 1.中国科学院西北生态环境资源研究院,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
    3.甘肃农业大学,甘肃 兰州 730070
  • 收稿日期:2020-04-22 修回日期:2020-08-24 出版日期:2020-12-09 发布日期:2020-12-09
  • 通讯作者: 何明珠
  • 作者简介:何明珠(E-mail: hmzecology@lzb.ac.cn
    唐亮(1994—),男,甘肃白银人,硕士研究生,主要从事生态学研究。E-mail: tangliangdyx@163.com
  • 基金资助:
    国家自然科学基金项目(41671103);宁夏公路建设管理局项目(WMKY1)

The spatial distribution of soil organic carbon in the main producing areas of traditional Chinese medicine in Longxi Gansu China

Liang Tang1,2(), Mingzhu He1(), Guangzu Bai1, Pengshan Zhao1, Jianxin Ren3, Hua Xu1,2   

  1. 1.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.Gansu Agricultural University,Lanzhou 730070,China
  • Received:2020-04-22 Revised:2020-08-24 Online:2020-12-09 Published:2020-12-09
  • Contact: Mingzhu He

摘要:

在2018年8月对陇西的200个采样点进行调查,利用相关性分析、方差分析、主成分分析、地统计分析,对采样点进行分析,探讨了陇西县土壤有机碳密度及其储量的空间分布特征,以及气候、地形、土地利用与土壤有机碳密度的关系。结果表明:(1)陇西县土壤0~50 cm层有机碳总量为6.29±2.41 Tg,有机碳密度为2.67±1.02 kg·m-2。其中0~10、10~30、30~50 cm土层的有机碳密度分别为0.63±0.17、1.10±0.38、0.93±0.48 kg·m-2,有机碳储量分别为1.49±0.41、2.58±0.90、2.21±1.11 Tg。(2)气温、降水量、海拔、汇流动力指数与各土层土壤有机碳密度都具有显著相关性;坡度、地形起伏度、地表粗糙度随着土壤深度的增加与土壤有机碳密度相关性逐渐减小,以至在30~50 cm土层土壤中不具有相关性;随着土壤深度的增加,地形湿度指数与有机碳密度的相关性逐渐增强,并在30~50 cm土层土壤中表现出显著负相关性。(3)土壤有机碳密度的空间分布特征为:从中部渭河平原到北部的丘陵地带和南部的山地区域,随着海拔的升高而逐渐升高,并且北山的土壤有机碳密度比南山高,渭河流域形成的河谷平原有机碳密度较低,各土层各等级土壤有机碳密度在各个乡镇中的分布表现出显著差异性。人均耕地面积较大的乡镇土壤有机碳密度较低,经济作物播种面积占比较大的乡镇土壤有机碳密度较高,中药材种植区单位面积投入较大的乡镇土壤有机碳密度较高。

关键词: 有机碳密度, 有机碳储量, 主成分回归克里金模型, 复合地形因子

Abstract:

In August 2018, 200 samples were surveyed in Longxi County. Using correlation analysis, analysis of variance, principal component analysis, and geostatistical analysis, we analyze sampling point data explored the spatial distribution characteristics of soil organic carbon density and reserves in Longxi County, and the relationship with climate, topography, and land use. The results showed that: (1) the total amount of organic carbon in soil from 0 to 50 cm was 6.29±2.41 Tg, and the SOCD was 2.67±1.02 kg·m-2. The SOCD in the 0-10 cm, 10-30 cm soil layers and 30-50 cm were 0.63±0.17, 1.10±0.38 and 0.93±0.48 kg·m-2, the organic carbon storagewere 1.49±0.41, 2.58±0.90 and 2.21±1.11 Tg, respectively. (2) Significant correlatios were observed between temperature, precipitation, elevation and Stream Power Index with SOCD in each soil layer. With the increase of soil depth, the correlations between slope, topographic relief and surface roughness with SOCD were gradually decreased, and no significant correlation was found in 30-50 cm soil layer. The correlation between topographic wetness index and SOCD was gradually increased and showed a significant negative correlation 30-50 cm soil layer. (3) The spatial distribution of SOCD as follows: the SOCD ratchet up from the central plains of the Wei River to the northern foothills and southern mountain areas with the rising of altitude. SOCD of Northern Mountain was higher than that of the Southern Mountain. The river valley plain formed by Wei River Basin has a lower organic carbon density. The distribution of soil organic carbon density in different soil layers and grades was markedly different. Due to the influence of human activities, the SOCD of the townships with large per capita cultivated land area was relatively low; the SOCD of the towns with large planted area of cash crops was relatively high; and SOCD of the towns with large per-mu investment in Chinese medicinal planting areas was relatively high. The SOCD was lower in the towns with larger arable land area per capita, higher in the towns where the planting area of cash crops was larger, higher in the towns with higher input per mu.

Key words: organic carbon density, organic carbon storage, principle component regression Kriging Model, composite terrain factor

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