Effects of Caragana intermedia stubble on soil water characteristics and water balance on the desert steppe

doi:10.11686/cyxb2023360

Abstract

Abstract:

Leaving stubble is an important method to optimize the management of Caragana intermedia on the desert steppe. The aim of this study was to determine the effects of Caragana stubble on the soil water characteristics and water balance， to provide a theoretical basis and practical guidance for rational cropping of Caragana on the desert steppe. A field study was conducted at a Caragana plantation in desert grassland of Ningxia， involving four cropping configurations： No stubble （WP）； one belt stubble and one belt no stubble （G₁P₁）， three belts stubble and three belts no stubble （G₃P₃）， and five belts stubble and five belts no stubble （G₅P₅）. The effects of these different cropping configurations on soil moisture and water balance were analyzed. It was found that： 1） The highest soil moisture content was in the G₃P₃ treatment， and the moisture content in the 0-200 cm soil layer increased with increasing soil depth； 2） Compared with natural grassland without Caragana， the WP， G₁P₁， G₃P₃， and G₅P₅ treatments all resulted in soil water deficit to varying degrees； the lowest water deficit index was in the G₃P₃ treatment， indicative of reduced soil water consumption. 3） Under the influence of environment and stubble treatments， the treatments were ranked， from highest transpiration of vegetation to lowest， as follows： G₃P₃<G₁P₁<G₅P₅<WP； and from highest evapotranspiration between trees to lowest， as follows： G₃P₃<G₁P₁<WP<G₅P₅. The ratio of evapotranspiration to rainfall was lowest in the G₃P₃ treatment. Based on the characteristics of soil water and water balance， the G₃P₃ treatment was more conducive to water retention and water balance in areas planted with Caragana on the desert steppe.

Key words: desert steppe, Caragana intermedia, stubble way, soil water, water deficiency, water balance

Teng-si HOU, Yan SHEN, Hong-bin MA, Peng FANG, Ying CAO. Effects of Caragana intermedia stubble on soil water characteristics and water balance on the desert steppe[J]. Acta Prataculturae Sinica, 2024, 33(8): 15-24.

Figures/Tables 9

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处理 Treatment	盖度 Coverage （%）	地上生物量 Aboveground biomass （g·m^-2）	Margalef丰富度指数Margalef richness index	Simpson优势度指数Simpson dominance index	Shannon-Wiener多样性指数Shannon-Wiener diversity index	Pielou均匀度指数Pielou evenness index	重要值比例Proportion of importance （%）
处理 Treatment	盖度 Coverage （%）	地上生物量 Aboveground biomass （g·m^-2）	Margalef丰富度指数Margalef richness index	Simpson优势度指数Simpson dominance index	Shannon-Wiener多样性指数Shannon-Wiener diversity index	Pielou均匀度指数Pielou evenness index	灌木Bush	PH	AH
WP	79.67±3.38a	89.46±5.90ab	1.30±0.10ab	0.25±0.02a	1.90±0.13ab	1.08±0.07ab	10.05	87.09	2.86
G₁P₁	58.67±3.18b	115.85±2.79a	1.37±0.11a	0.17±0.02ab	2.13±0.09ab	1.03±0.09ab	28.20	66.21	5.59
G₃P₃	59.67±2.33b	58.82±4.35b	1.09±0.05b	0.15±0.03b	2.27±0.09a	1.18±0.04a	26.06	73.94	0.00
G₅P₅	76.67±6.06a	73.58±6.53b	1.13±0.08ab	0.25±0.04a	1.80±0.12b	0.99±0.04b	23.78	59.09	17.13

处理 Treatment	盖度 Coverage （%）	地上生物量 Aboveground biomass （g·m^-2）	Margalef丰富度指数Margalef richness index	Simpson优势度指数Simpson dominance index	Shannon-Wiener多样性指数Shannon-Wiener diversity index	Pielou均匀度指数Pielou evenness index	重要值比例Proportion of importance （%）
处理 Treatment	盖度 Coverage （%）	地上生物量 Aboveground biomass （g·m^-2）	Margalef丰富度指数Margalef richness index	Simpson优势度指数Simpson dominance index	Shannon-Wiener多样性指数Shannon-Wiener diversity index	Pielou均匀度指数Pielou evenness index	灌木Bush	PH	AH
WP	79.67±3.38a	89.46±5.90ab	1.30±0.10ab	0.25±0.02a	1.90±0.13ab	1.08±0.07ab	10.05	87.09	2.86
G₁P₁	58.67±3.18b	115.85±2.79a	1.37±0.11a	0.17±0.02ab	2.13±0.09ab	1.03±0.09ab	28.20	66.21	5.59
G₃P₃	59.67±2.33b	58.82±4.35b	1.09±0.05b	0.15±0.03b	2.27±0.09a	1.18±0.04a	26.06	73.94	0.00
G₅P₅	76.67±6.06a	73.58±6.53b	1.13±0.08ab	0.25±0.04a	1.80±0.12b	0.99±0.04b	23.78	59.09	17.13

处理 Treatment	降水量 Precipitation （P， mm）	植被蒸腾量 Vegetation transpiration （mm）	棵间蒸散量 Evapotranspiration among trees （mm）	蒸散量 Evapotranspiration （ET， mm）	储水变化量 Change in water storage （mm）	蒸散量/降水量 ET/P
WP	336.80	225.06	64.21	380.20	-43.40	1.13
G₁P₁	336.80	185.86	58.11	334.90	1.90	0.99
G₃P₃	336.80	182.72	52.97	326.63	10.17	0.97
G₅P₅	336.80	204.66	66.33	361.92	-25.12	1.07

处理 Treatment	降水量 Precipitation （P， mm）	植被蒸腾量 Vegetation transpiration （mm）	棵间蒸散量 Evapotranspiration among trees （mm）	蒸散量 Evapotranspiration （ET， mm）	储水变化量 Change in water storage （mm）	蒸散量/降水量 ET/P
WP	336.80	225.06	64.21	380.20	-43.40	1.13
G₁P₁	336.80	185.86	58.11	334.90	1.90	0.99
G₃P₃	336.80	182.72	52.97	326.63	10.17	0.97
G₅P₅	336.80	204.66	66.33	361.92	-25.12	1.07

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