荒漠草原灌丛转变土壤水分与地上生物量空间异质性及阈值响应

doi:10.11707/j.1001-7488.20211201

Abstract

Abstract:

Objective: In order to provide theoretical foundation for desert steppe vegetation conservation, the spatial characteristics of soil water content and above-ground vegetation biomass and the appropriate soil moisture threshold in desert steppe-shrubland transition in eastern Ningxia were analyzed. Method: Spatial heterogeneity of soil moisture in 0-200 cm soil layer and the related above-ground biomass were investigated in 43 shrubland sites and 43 grassland sites of desert steppe in eastern Ningxia via GIS and geostatistics methods. Result: It was shown that soil moisture was higher in grassland (6.23%) than that in shrubland (5.47%), with the variation ranging from 1.37% to 25.36% in the former and 1.5% to 19.58% in the latter, especially in the 80-200 cm soil layer. The coefficient of variation (CV) of soil moisture moderately ranged from 28.94% to 62.30% in both vegetation types between which soil moisture in shrubland was generally higher than that in grassland. And the related above-ground biomass was higher in shrubland (0.56 kg·m^-2) than that in grassland (0.06 kg·m^-2), and the coefficients of variation were moderate for both. Geostatistical results showed that the structural variation ratio [C/(C₀+C)] of soil moisture in 0-120 cm soil layer was higher in grassland (0.75) than that in shrubland (0.64). The structural variation ratio of soil moisture between 0-120 cm soil layer gradually decreased along with the increase of soil depth. The range (A₀) in shrubland (45.84 km) was higher than that in grassland (18.56 km) (P < 0.05), and the soil moisture in 120-200 cm soil layer followed a pure nugget effect model. The structural variation ratio of above-ground biomass was higher in shrubland (0.76) than that of grassland (0.37), and the range (A₀) in grassland (43.91 km) was significantly higher than that of shrubland (12.77 km) (P < 0.05). We obtained the suitable soil moisture threshold 8.11%-14.19% in the transition from desert grassland to shrubland according to the response characteristics of above-ground biomass and soil moisture. Conclusion: During the transition from desert grassland to shrubland, accelerated deep soil water consumption accompanied with the increased above-ground biomass and related spatial heterogeneity and the decreased spatial heterogeneity of soil moisture in landscape scale. And the pure nugget effect model was found for deeper soil layer moisture in grassland and shrubland due to increased rainfall in the survey and previous years.

Key words: desert steppe, introduced shrub, soil moisture, biomass, spatial heterogeneity

CLC Number:

S718.51

Yanan Zhao,Yafeng Zhao,Hongmei Wang,Yanping Ma,Zhili Li. Response of Spatial Heterogeneity and Threshold Value for Soil Water and Aboveground Biomass of Desert Grassland-Shrubland Anthropogenic Transition in Desert Steppe of Ningxia, China[J]. Scientia Silvae Sinicae, 2021, 57(12): 1-12.

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样地类型 Sample plot type	土层 Soil layer/ cm	最小值 Minimum (%)	最大值 Maximum (%)	平均值 Mean (%)	SD (%)	CV (%)	峰度 Skew	偏度 Kurtosis
草地 Grassland	0~20	2.29	9.50	5.20	1.74	33.48	0.58	-0.10
	20~40	1.37	8.85	4.45	1.77	39.78	0.63	-0.06
	40~60^*	1.46	10.73	4.47	2.04	45.77	1.23	1.37
	60~80^*	1.93	11.98	5.08	2.58	50.74	1.06	0.59
	80~100^*	1.93	13.48	5.52	2.88	52.18	1.20	0.94
	100~120^*	2.40	17.33	6.32	3.31	52.44	1.45	2.30
	120~140^*	2.53	16.50	7.23	3.76	51.98	1.02	0.03
	140~160^*	2.50	17.29	7.66	3.78	49.38	0.82	-0.07
	160~180^*	2.33	23.98	8.39	4.74	56.45	1.46	2.15
	180~200^*	2.60	25.36	7.98	4.63	58.01	1.85	4.19

灌丛 Shrubland	0~20^*	2.51	9.08	4.69	1.36	28.94	0.78	1.39
	20~40^*	1.63	16.73	4.50	2.40	53.32	3.32	15.88
	40~60^*	1.43	12.61	4.39	2.34	53.41	1.59	2.99
	60~80^*	1.61	8.12	4.16	1.62	38.90	0.58	-0.22
	80~100^*	1.51	12.96	4.94	2.74	55.44	1.21	0.88
	100~120^*	1.50	17.33	5.61	3.50	62.30	1.67	2.53
	120~140^*	1.98	19.58	6.52	3.65	55.96	1.47	2.72
	140~160^*	2.19	19.19	6.65	3.88	58.35	1.19	1.24
	160~180^*	2.24	17.09	6.58	3.68	55.97	1.17	0.57
	180~200^*	1.70	18.53	6.65	3.78	56.91	1.17	1.24

样地类型 Sample plot type	土层 Soil layer/cm	块金值 Nugget C₀	基台值 Sill C₀+C	结构方差比 Structural variance ratio C₀+C)	变程Range A₀/km	最优模型 Best model	R²	残差平方和 Residual sum of squares(RSS)
草地 Grassland	0~20	0.000 0	0.000 3	1.00	5.22	高斯模型 Gaussian model	0.72	1.64E-08
	20~40	0.000 1	0.000 3	0.61	8.66	高斯模型 Gaussian model	0.49	3.12E-08
	40~60	0.000 1	0.185 2	1.00	7.66	高斯模型 Gaussian model	0.92	2.88E-03
	60~80	0.050 7	0.243 4	0.79	16.65	球状模型 Spherical model	0.61	1.58E-02
	80~100	0.053 0	0.390 0	0.86	31.64	指数模型 Exponential model	0.81	1.44E-02
	100~120	0.194 9	0.262 7	0.26	41.55	线性模型 Linear model	0.50	1.24E-02
	120~140	—	—	—	—	纯块金效应 Pure nugget effect	—	—
	140~160	—	—	—	—	纯块金效应 Pure nugget effect	—	—
	160~180	—	—	—	—	纯块金效应 Pure nugget effect	—	—
	180~200	—	—	—	—	纯块金效应 Pure nugget effect	—	—

灌丛 Shrubland	0~20	0.043 0	0.503 0	0.91	107.45	高斯模型 Gaussian model	0.86	1.02E-03
	20~40	0.000 1	0.188 2	1.00	6.77	指数模型Exponential model	0.71	8.14E-03
	40~60	0.000 1	0.251 2	1.00	4.00	高斯模型 Gaussian model	0.56	2.32E-02
	60~80	0.000 2	0.000 4	0.53	69.04	指数模型Exponential model	0.27	3.09E-08
	80~100	0.182 4	0.263 5	0.31	43.86	线性模型 Linear model	0.26	1.60E-02
	100~120	0.273 0	0.310 9	0.12	43.89	线性模型 Linear model	0.03	4.95E-02
	120~140	—	—	—	—	纯块金效应 Pure nugget effect	—	—
	140~160	—	—	—	—	纯块金效应 Pure nugget effect	—	—
	160~180	—	—	—	—	纯块金效应 Pure nugget effect	—	—
	180~200	—	—	—	—	纯块金效应 Pure nugget effect	—	—

样地类型 Sample plot type	最小值 Minimum/(kg·m^-2)	最大值 Maximum/(kg·m^-2)	平均值 Mean/(kg·m^-2)	SD/ (kg·m^-2)	CV (%)	峰度 Skew	偏度 Kurtosis
草地Grassland^*	0.01	0.15	0.06	0.03	47.02	0.80	0.66
灌丛Shrubland^*	0.07	1.47	0.56	0.31	61.44	0.76	0.92

样地类型 Sample plot type	块金值 Nugget C₀	基台值 SillC₀+C	结构方差比 Structural variance ratio C₀+C)	变程 RangeA₀/km	最优模型 Best model	R²	残差平方和 Residual sum of squares (RSS)
草地Grassland	0. 201 7	0.32	0.37	43.91	线性模型Linear model	0.53	2.42E-02
灌丛Shrubland	0.145 0	0.60	0.76	12.77	球状模型Spherical model	0.64	1.35E-01

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Response of Spatial Heterogeneity and Threshold Value for Soil Water and Aboveground Biomass of Desert Grassland-Shrubland Anthropogenic Transition in Desert Steppe of Ningxia, China

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