草甸草原放牧场退化定量评估指标体系建立

doi:10.3864/j.issn.0578-1752.2021.15.017

Abstract

Abstract:

【Background】 Inner Mongolia grassland is an important natural ecological barrier in northern China, among which meadow steppe is located in the transition zone from forest to grassland, and it is a very valuable natural renewable resource in China. The proportion of meadow grassland in Inner Mongolia is the largest in China, most of which are pastures. Grazing is one of the most important ways for human beings to affect grassland ecosystem. Excessive grazing will lead to retrograde succession of grassland community, and grassland production performance will be continuously reduced, thus limiting the stable development of grassland animal husbandry. 【Objective】 Comprehensive, accurate and timely assessment of pasture degradation is of great significance for maintaining and promoting sustainable grassland utilization. 【Method】 In this study, the degradation succession law and driving mechanism of grassland pasture were summarized, and the degradation index system of grassland pasture in Inner Mongolia was established by using analytic hierarchy process (AHP), expert investigation and comparative matrix analysis methods, which included 8 indexes, such as aboveground biomass, coverage, average height, plant species, litter, proportion of degradation indicator plant, soil organic carbon content and soil bulk density. Based on the establishment of the comprehensive evaluation index model, the parameters of the reference index were put forward, and the comprehensive index of quantitative evaluation was used to reflect the overall situation of grassland degradation. At the same time, the quantitative evaluation index system of grassland degradation in Inner Mongolia and its technical method were discussed and studied. This method was evaluated and verified based on the controlled grazing experiment in Xeltala of Hulunbuir. 【Result】 The results showed that the weight of the eight indexes from the largest to the smallest in the evaluation index system of Inner Mongolia meadow steppe were aboveground biomass, coverage, average height, proportion of degraded plants, number of plant species, litter, soil organic carbon content, and proportion of soil bulk density increase. Meadow grassland degradation could be classified into four grades: non-degradation, mild degradation, moderate degradation and severe degradation. When the grazing was equal to zero or very light grazing, the grassland belonged to the scope of non-degraded grassland. When the grazing rate was above 90%, the grassland belonged to the range of severely degraded grassland. 【Conclusion】 It was suggested that a longer period of discussion should be carried out in the future research to further improve and update the benchmark reference value, which was conducive to the improvement and maturity of the evaluation index system of pasture degradation, and could provide a basis for quantitative assessment of pasture degradation.

Key words: meadow steppe, degradation of grazing land, index screening, quantitative evaluation

YAN RuiRui, GAO Wa, SHEN BeiBei, ZHANG Yu, WANG Miao, ZHU XiaoYu, XIN XiaoPing. Index System for Quantitative Evaluation of Pasture Degradation in Meadow Grassland of Inner Mongolia[J].Scientia Agricultura Sinica, 2021, 54(15): 3343-3354.

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Figures/Tables 7

Fig. 1

Table 1

Expert survey method for screening index judgment matrix"

指标 Factor	平均高度 Height	地上生物量 Above-ground biomass	盖度 Coverage	中型禾草占比例 Proportion of medium grasses	枯落物量 Amount of litter	退化指示植物比例 Degradation indicates plant proportion	裸斑、盐碱斑比例 Bare spot, saline-alkali spot ratio	可食草种占总量比例 Proportion of herbivores in the total	可食草种增加率 Increase rate of herbivores	不可食草占总量比例 Non-herbivores as a percentage of the total	有害草占总量比例 Proportion of harmful grass in total
平均高度 Height	1	1	1	2	4	1	2	2	3	2	2
地上生物量 Above-ground biomass	1	1	1	2	5	1	2	2	4	3	3
盖度 Coverage	1	1	1	2	4	1	2	2	3	2	3
中型禾草占比例 Proportion of medium grasses	1/2	1/2	1/2	1	2	1/2	1	1	2	1	2
枯落物量 Amount of litter	1/4	1/5	1/4	1/2	1	1/4	1/2	1/2	1	1/2	1
退化指示植物比例 Degradation indicates plant proportion	1	1	1	2	4	1	2	1	3	2	2
裸斑、盐碱斑比例 Bare spot, saline-alkali spot ratio	1/2	1/2	1/2	1	2	1/2	1	1	2	1	1
可食草种占总量比例 Proportion of herbivores in the total	1/2	1/2	1/2	1	2	1	1	1	2	2	2
可食草种增加率 Increase rate of herbivores	1/3	1/4	1/3	1/2	1	1/3	1/2	1/2	1	1	1
不可食草占总量比例 Non-herbivores as a percentage of the total	1/2	1/3	1/2	1	2	1/2	1	1/2	1	1	1
有害草占总量比例 Proportion of harmful grass in total	1/2	1/3	1/3	1/2	1	1/2	1	1/2	1	1	1
土壤侵蚀模增加比例 Soil erosion patterns increase in proportion	1/3	1/3	1/3	1/2	1	1/3	1/2	1/2	1	1	1
鼠洞面积占草地面积比例 Proportion of rat hole area to grassland area	1/5	1/5	1/5	1/3	1	1/4	1/2	1/3	1/2	1/2	1/2
土壤容重增加比例 Proportion of soil bulk density increased	1/2	1/2	1/2	1	3	1	1	1	2	1	2
土壤全氮减少比例 Proportion of TN decreased	1/4	1/4	1/4	1/2	1	1/3	1/2	1/2	1	1/2	1/2
土壤含盐量增加比例 Proportion of soil salt increased	1/9	1/9	1/9	1/6	1/3	1/9	1/6	1/7	1/4	1/5	1/4
有机质含量减少比例 Organic matter content decreases proportionally	1/2	1/2	1/2	1	2	1/2	1	1	1	1	1
禾草类占比例 Proportion of grasses	1/4	1/5	1/5	1/3	1	1/4	1/2	1/3	1/2	1/2	1/2
沙化指示植物增加比例 Desertification indicates an increased proportion of plants	1/4	1/4	1/4	1/2	1	1/3	1/2	1/2	1	1/2	1/2
盐渍化指示植物增加比例 Salinization indicates an increased proportion of plants	1/4	1/5	1/4	1/2	1	1/2	1/2	1/3	1/2	1/2	1/2
土壤有机碳比例 Proportion of SOC	1/2	1/2	1/2	1	3	1	1	1	2	1	2
植物种类 Plants species	1/2	1/2	1/2	1	3	1	1	1	2	2	2
指标 Factor	土壤侵蚀模增加比例 Soil erosion patterns increase in proportion	鼠洞面积占草地面积比例 Proportion of rat hole area to grassland area	土壤容重增加比例 Proportion of soil bulk density increased	土壤全氮减少比例 Proportion of TN decreased	土壤含盐量增加比例 proportion of soil salt increased	有机质含量减少比例 Organic matter content decreases proportionally	禾草类占比例 Proportion of grasses	沙化指示植物增加比例 Desertification indicates an increased proportion of plants	盐渍化指示植物增加比例 Salinization indicates an increased proportion of plants	土壤有机碳比例 Proportion of SOC	植物种类 Plants species
平均高度 Height	3	5	2	4	9	2	4	4	4	2	2
地上生物量 Above-ground biomass	3	5	2	4	9	2	5	4	4	2	2
盖度 Coverage	3	5	2	4	9	2	5	4	4	2	2
中型禾草占比例 Proportion of medium grasses	2	3	1	2	6	1	3	2	2	1	1
枯落物量 Amount of litter	1	1	1/3	1	3	1/2	1	1	1	1/3	1/3
退化指示植物比例 Degradation indicates plant proportion	3	4	1	3	9	2	4	3	2	1	1
裸斑、盐碱斑比例 Bare spot, saline-alkali spot ratio	2	2	1	2	6	1	2	2	2	1	1
可食草种占总量比例 Proportion of herbivores in the total	2	3	1	2	7	1	3	2	3	1	1
可食草种增加率Increase rate of herbivores	1	2	1/2	1	4	1	2	1	2	1/2	1/2
不可食草占总量比例 Non-herbivores as a percentage of the total	1	2	1	2	5	1	2	2	2	1	1/2
有害草占总量比例 Proportion of harmful grass in total	1	2	1/2	2	4	1	2	2	2	1/2	1/2
土壤侵蚀模增加比例 Soil erosion patterns increase in proportion	1	1	1/2	1	4	1	2	1	2	1/2	1/2
鼠洞面积占草地面积比例 Proportion of rat hole area to grassland area	1	1	1/3	1	2	1/2	1	1	1	1/3	1/3
土壤容重增加比例 Proportion of soil bulk density increased	2	3	1	2	7	1	3	2	3	1	1
土壤全氮减少比例 Proportion of TN decreased	1	1	1/2	1	3	1/2	1	1	1	1/2	1/3
土壤含盐量增加比例 Proportion of soil salt increased	1/4	1/2	1/7	1/3	1	1/5	1/2	1/3	1/3	1/7	1/8
有机质含量减少比例 Organic matter content decreases proportionally	1	2	1	2	5	1	2	2	2	1	1
禾草类占比例 Proportion of grasses	1/2	1	1/3	1	2	1/2	1	1	1	1/3	1/3
沙化指示植物增加比例 Desertification indicates an increased proportion of plants	1	1	1/2	1	3	1/2	1	1	1	1/3	1/3
盐渍化指示植物增加比例 Salinization indicates an increased proportion of plants	1/2	1	1/3	1	3	1/2	1	1	1	1/3	1/3
土壤有机碳比例 Proportion of SOC	2	3	1	2	7	1	3	3	3	1	1
植物种类 Plants species	2	3	1	3	8	1	3	3	3	1	1

Table 1

Table 2

Table 3

Table 4

Table 5

Fig. 2

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指标 Factor	权重Weight
地上生物量Above-ground biomass	0.093
盖度Coverage	0.089
平均高度Average height	0.087
退化指示植物比例Degradation indicates plant proportion	0.071
植物种类Plants species	0.056
枯落物量Amount of litter	0.055
土壤有机碳比例Proportion of SOC	0.053
可食草种占总量比例Proportion of herbivores in the total	0.052
土壤容重增加比例Proportion of soil bulk density increased	0.052
中型禾草占比例Proportion of medium grasses	0.048
裸斑、盐碱斑比例Bare spot, saline-alkali spot ratio	0.045
有机质含量减少比例Organic matter content decreases proportionally	0.041
不可食草占总量比例Non-herbivores as a percentage of the total	0.038
有害草占总量比例Proportion of harmful grass in total	0.033
可食草种增加率Increase rate of herbivores	0.029
土壤侵蚀模增加比例Soil erosion patterns increase in proportion	0.028
全氮减少比例 Proportion of TN decreased	0.022
沙化指示植物增加比例Desertification indicates an increased proportion of plants	0.022
盐渍化指示植物增加比例Salinization indicates an increased proportion of plants	0.020
鼠洞面积占草地面积比例 Proportion of rat hole area to grassland area	0.019
禾草类占比例Proportion of grasses	0.018
土壤含盐量增加比例proportion of soil salt increased	0.008

因子 Factor	1	2	3	4	5	6	7	8	9	10	11	12	权重平均 Average weight
地上生物量 Above-ground biomass (kg·hm^-2)	0.2	0.2	0.15	0.15	0.25	0.2	0.2	0.25	0.2	0.2	0.2	0.25	0.20
盖度Coverage (%)	0.15	0.1	0.2	0.1	0.1	0.1	0.2	0.15	0.25	0.15	0.2	0.1	0.15
平均高度Average height (cm)	0.1	0.15	0.1	0.2	0.1	0.2	0.1	0.05	0.15	0.2	0.2	0.2	0.15
植物种数Plants species (种/m²)	0.15	0.1	0.1	0.1	0.15	0.1	0.1	0.1	0.1	0.05	0.1	0.1	0.10
枯落物量Amount of litter (kg·hm^-2)	0.05	0.1	0.1	0.05	0.1	0.05	0.1	0.15	0.1	0.1	0.1	0.15	0.10
退化指示植物比例 Degradation indicates plant proportion (%)	0.15	0.1	0.15	0.1	0.1	0.15	0.1	0.15	0.1	0.1	0.1	0.05	0.11
土壤有机碳含量Soil organic carbon (g·kg^-1)	0.1	0.15	0.1	0.15	0.1	0.1	0.1	0.05	0.05	0.1	0.1	0.05	0.10
土壤容重Soil bulk (g·cm^-3)	0.1	0.1	0.1	0.15	0.1	0.1	0.1	0.1	0.05	0.1	0.1	0.1	0.10

指标 Factor	评估指标参考最大值（Axn）
地上现存量Aboveground stock (kg·hm^-2)	3400
盖度Coverage (%)	87
平均高度Average height (cm)	75
植物种数Plants species (种/m²)	50
枯落物量Amount of litter (kg·hm^-2)	2600
退化指示植物比例 Degradation indicates plant proportion (%)	90
土壤有机碳含量Soil organic carbon (g·kg^-1)	45
土壤容重Soil bulk (g·cm^-3)	1.35

退化程度分级 Grade of degradation	综合指标指数（EI）
未退化 No degradation	EI≥65
轻度退化 Mild degradation	50≤EI <65
中度退化 Moderate degradation	35≤EI <50
重度退化 heavy degradation	EI <35

Index System for Quantitative Evaluation of Pasture Degradation in Meadow Grassland of Inner Mongolia

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