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新疆干旱区8种常见灌丛生物量碳和土壤有机碳特征

王鑫1,2,3,4,杨德刚1*,熊黑钢2,柳妍妍1,2,3,公延明1,2,3
  

  1. (1中国科学院新疆生态与地理研究所, 乌鲁木齐 830011; 2新疆大学资源与环境科学学院, 乌鲁木齐 830046; 3中国科学院大学, 北京 100049; 4中国科学院新疆分院, 乌鲁木齐 830011)
  • 出版日期:2016-08-10 发布日期:2016-08-10

Characteristics of biomass carbon and soil organic carbon of 8 common shrubs in arid regions of Xinjiang.

WANG Xin1,2,3,4, YANG De-gang1*, XIONG Hei-gang2, LIU Yan-yan1,2,3, GONG Yan-ming1,2,3#br#   

  1. (1Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2 College of Resource and Environment Sciences, Xinjiang University, Urumqi 830046, China; 3University of Chinese Academy of Sciences, Beijing 100049, China; 4Xinjiang Branch, Chinese Academy of Sciences, Urumqi 830011, China).
  • Online:2016-08-10 Published:2016-08-10

摘要:

对广布于新疆南北疆各地的8种灌丛(白刺Nitraria tangutorum、高枝假木贼Anabasis elatior、白梭梭Haloxylon persicum、沙拐枣Calligonum mongolicum、狭叶锦鸡儿Caragana stenophylla、膜果麻黄Ephedra przewalskii、短叶假木贼Anabasis brevifolia和金露梅Potentilla fruticosa)生物量碳和土壤有机碳的分布特征进行了研究。结果表明:1)生物量碳密度金露梅>狭叶锦鸡儿>膜果麻黄>白梭梭>沙拐枣>白刺>短叶假木贼>高枝假木贼。除金露梅灌丛地上生物量碳密度高于地下外,其余7种灌丛地下生物量碳密度均高于地上。2)土壤有机碳与生物量碳密切相关,除膜果麻黄、短叶假木贼和金露梅灌丛外,其余5种灌丛土壤有机碳密度最高值均出现在0~10 cm土层,且随土壤深度的增加而降低。3)新疆地区植物8种灌丛生物量碳储量和土壤有机碳储量分别在(0.41±0.05)×104~(33.46±0.60)×104 Mg和(0.22±0.01)~(6.88±0.03) Tg。4)土壤有机碳与海拔呈显著正相关(P<0.05),与土壤含水量、有机质、全N含量呈极显著正相关(P<0.01),与容重呈显著负相关;地上生物量碳与海拔、土壤含水量呈显著正相关,与土壤有机质、全N含量、有机碳、地下生物量碳呈极显著正相关;地下生物量碳与土壤有机质、全N含量呈极显著正相关。
 

关键词: 相对影响指数, 实际净初级生产力, 定量评价, 净初级生产力损失, 人类活动

Abstract: In this study, plants and soil samples were collected from 8 dominant shrub communities including Nitraria tangutorum, Anabasis elatior, Haloxylon persicum, Calligonum mongolicum, Caragana stenophylla, Ephedra przewalskii, A. brevifolia and Potentilla fruticose that extensively distribute in Xinjiang. By determining the contents of plant biomass carbon (PBC) and soil organic carbon (SOC), this study aimed at assessing the variation of PBC and SOC contents among the different shrub communities. The results showed that: (1) The values of PBC density from different shrub communities exhibited the following pattern: P. fruticose > C. stenophylla > E. przewalskii > H. persicum > C. mongolicum > N. tangutorum > A. brevifolia > A. elatior. Except for P. fruticose, the other shrub communities’ underground PBC densities were higher than those above ground. (2) The SOC density was strongly related to the PBC density. Except for E. przewalskii, A. brevifolia and P. fruticose species, the other shrub communities’ maximum SOC densities occurred in 0-10 cm soil layer, and decreased with the increase of soil depth. (3) The storage values of PBC and SOC in the eight shrub communities ranged from (0.41±0.05) × 104 to (33.46±0.60) × 104 Mg and from (0.22±0.01) to (6.88±0.03) Tg, respectively. (4) The SOC content was significantly positively correlated to altitude (P < 0.05), very significantly positively correlated to soil water content, and soil organic matter (SOM) and total nitrogen (TN) contents (P<0.01), while significantly negatively correlated to soil bulk density. The aboveground PBC content was significantly positively correlated to altitude and soil water content, and very significantly positively correlated to SOM, TN, SOC and underground PBC contents, while a very significant positive correlation was observed between underground PBC content and SOM and TN contents.

Key words: loss of net primary productivity, relative contribution index, act net primary productivity, human activity, quantitative assessment.