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Volume 37 Issue 5
Oct.  2018
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Article Navigation >  CARSOLOGICA SINICA  > 2018  >  37(5): 742-751
LAN Funing, LI Yanqing, ZHAO Yi, ZHU Tongbing, JIANG Zhongcheng, WU Huaying, ZHU Xiuqun, HOU Shitian. Influence of grazing on characteristics of chemical metrology for C, N and P in plants and soil of peak-cluster depressions[J]. CARSOLOGICA SINICA, 2018, 37(5): 742-751. doi: 10.11932/karst20180512
Citation: LAN Funing, LI Yanqing, ZHAO Yi, ZHU Tongbing, JIANG Zhongcheng, WU Huaying, ZHU Xiuqun, HOU Shitian. Influence of grazing on characteristics of chemical metrology for C, N and P in plants and soil of peak-cluster depressions[J]. CARSOLOGICA SINICA, 2018, 37(5): 742-751. doi: 10.11932/karst20180512
shu

Influence of grazing on characteristics of chemical metrology for C, N and P in plants and soil of peak-cluster depressions

doi: 10.11932/karst20180512
  • 1.

    Institute of Karst Geology, Chinese Academy of Geosceinces/Key Laboratory for Karst Ecological Systems and Reduction and Control of Rock Desertification, Ministry of Land and Resources /Key Laboratory for Karst Dynamics, Desertification, Ministry of Natural Resources and Guangxi Province, Guilin, Guangxi 541004, China

  • 2.

    Institute of Karst Geology, Chinese Academy of Geosceinces/Key Laboratory for Karst Ecological Systems and Reduction and Control of Rock Desertification, Ministry of Land and Resources /Key Laboratory for Karst Dynamics, Desertification, Ministry of Natural Resources and Guangxi Province, Guilin, Guangxi 541004, China/China University of Geosciences,Wuhan,Hubei 4300074, China

  • 3.

    Institute of Karst Geology, Chinese Academy of Geosceinces/Key Laboratory for Karst Ecological Systems and Reduction and Control of Rock Desertification, Ministry of Land and Resources /Key Laboratory for Karst Dynamics, Desertification, Ministry of Natural Resources and Guangxi Province, Guilin, Guangxi 541004, China

  • 4.

    Institute of Karst Geology, Chinese Academy of Geosceinces/Key Laboratory for Karst Ecological Systems and Reduction and Control of Rock Desertification, Ministry of Land and Resources /Key Laboratory for Karst Dynamics, Desertification, Ministry of Natural Resources and Guangxi Province, Guilin, Guangxi 541004, China

  • 5.

    Institute of Karst Geology, Chinese Academy of Geosceinces/Key Laboratory for Karst Ecological Systems and Reduction and Control of Rock Desertification, Ministry of Land and Resources /Key Laboratory for Karst Dynamics, Desertification, Ministry of Natural Resources and Guangxi Province, Guilin, Guangxi 541004, China

  • 6.

    Institute of Karst Geology, Chinese Academy of Geosceinces/Key Laboratory for Karst Ecological Systems and Reduction and Control of Rock Desertification, Ministry of Land and Resources /Key Laboratory for Karst Dynamics, Desertification, Ministry of Natural Resources and Guangxi Province, Guilin, Guangxi 541004, China

  • 7.

    Institute of Karst Geology, Chinese Academy of Geosceinces/Key Laboratory for Karst Ecological Systems and Reduction and Control of Rock Desertification, Ministry of Land and Resources /Key Laboratory for Karst Dynamics, Desertification, Ministry of Natural Resources and Guangxi Province, Guilin, Guangxi 541004, China/China University of Geosciences, Beijing 100083, China

  • 8.

    China University of Geosciences, Beijing 100083, China/Center for Geological Tests and Measurements, Chinese Academy of Geosciences, Beijing 100037, China

  • Publish Date: 2018-10-25
    Abstract
  • The study area of this work is the Pinguo rock desertification region is a typical karst peak-cluster depression of southwestern China. Choosing vegetation sites with and without grazing, we examine the influence of grazing on the features of metrology of ecological chemistry for elements C, N, and P in plants and soil. Results show that (1) in six sites with grazing, average contents of C, N and P in the soil (0~20 cm) are 6.27%, 0.57%, and 0.088%, respectively; those in roots, stem, leaf and fallen materials are 442.15 g·kg-1, 8.33 g·kg-1and 0.73 g·kg-1, respectively. It means that due to grazing, contents of C, N and P in plants and soil decrease and variation coefficients become larger, leading to occurrence or deterioration of desertification. (2) The average values of C∶N, C∶P and N∶P at the six sites are 10.76, 73.94 and 6.76, respectively; those in roots, stem, leaf and fallen materials are 53.62, 669.50, and 12.53, respectively. Compared with the sites without grazing, these ratios of chemical metrology at grazed sites tend to decline. To some extent, grazing can enhance effectiveness of P in soil, but the growth of plants will be limited by N when N∶P reduces to a threshold. (3) C, N and P and their ratios in soil and plants at sites without grazing are all better than those at sites with grazing. It implies that in a short time grazing can cause rapid degeneration of the environment and occurrence or acceleration of rock desertification. After grazing is stopped, nutrient in soil and plants can recover in a short time, especially the plants of herbaceous feed can grow normally again. (4) In karst desertification regions of karst peak-cluster depressions, C, N, P, C∶N, C∶P and N∶P are closely related in samples of soil and plants. These variables can promote or suppress between each other, jointly affecting growth and development of plants and evolution trend of desertification in the study area.

     

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