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[1]LI Shengping,WANG Kelin.Effect of Human Disturbance on Soil Nutrients and Plant Diversity of Grassland in Karst Mountain[J].Research of Soil and Water Conservation,2016,23(05):20-27.

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Effect of Human Disturbance on Soil Nutrients and Plant Diversity of Grassland in Karst Mountain

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 05 Page number: 20-27 Column: Public date: 2016-10-28

Title:: Effect of Human Disturbance on Soil Nutrients and Plant Diversity of Grassland in Karst Mountain

Author(s):: LI Shengping^1,2,3, WANG Kelin^1,2; 1. Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
2. Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang, Guangxi 547100, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: Karst mountain grassland; human disturbance; soil nutrients; plant diversity

CLC:: S151.9;S152.4

DOI:: -

Abstract:: The successional rule of vegetation and dynamics of soil nutrients elements under human disturbance were studied in Karst mountain grassland for three years, which would promote the degraded ecosystem restoration and reconstruction in northwest Guangxi. We employed overall and sample quad rate investigation method and took the grassland as control (CK), and studied the relationship between the plant diversity and soil nutrients by correlation analysis and redundancy analysis. The results are as follows: (1) The vegetation coverage, aboveground biomass, richness index and diversity index of grassland in Karst mountain significantly reduced (p < 0.05), and human disturbance had no significant effect on evenness index and dominance index, which suggested that human disturbance did not change in fundamental species. (2) The soil bulk density and pH significantly increased (p < 0.05), soil water content and soil electrical conductivity reduced. (3) The soil nutrients were significantly reduced except the soil phosphorus (p < 0.05), indicating that human disturbance had no significant effect on soil phosphorus (p > 0.05). The soil available nutrients were more sensitive to the total soil nutrients which the soil available nutrients had a higher range ability. (4) Correlation analysis showed that the soil environmental factors were different in human disturbance area and CK, suggesting that the soil available nutrients and total soil nutrients played a dominant role. All of the soil nutrients had the significant difference by the correlation coefficient in human disturbance area and CK, which illustrated the uniformity of underground ecosystem such as soil nutrients and other various indicators, and they showed unity and synchronicity as an interaction organic whole. And the soil available nutrients had a significant difference from the the total soil nutrients (p < 0.01), which indicated the soil available nutrients were mainly depended on the total soil nutrients. (5) Redundancy analysis indicated that the change order of plant and soil were the same in human disturbance area and CK, while the human disturbance had an effect on the soil nutrient, and then resulted in the different RDA figure, and the sorting shaft could reflect the characteristics of the gradient soil factors, which showed that using soil nutrients as the sensitivity of soil indicating factors of Karst mountain grassland soil-vegetation relationship was feasible.

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