河套灌区不同配置农田防护林对田间土壤水分和养分储量的影响

doi:10.13866/j.azr.2023.08.07

Abstract

Abstract:

As an effective agricultural management method for improving ecological and environmental benefits, the farmland shelterbelt system is crucial in improving soil physical and chemical properties, the ecological environment, and crop yield. This study clarifies the effects of this system on ecosystem functions and provides a guide for the ecological restoration of fragile ecosystems. In the Hetao Irrigation District, three typical farmland shelterbelts (four-, five-, and eight-line patterns) were selected to measure soil properties at a 0-100 cm depth and vegetation properties of shelterbelts and farmland at different distances (0.3 H, 0.7 H, 1 H, 2 H, 3 H, and 4 H) from the shelterbelts during the growing seasons from 2019 to 2021. Soil moisture storage (SMS) and soil nutrient storage [soil carbon storage (SCS), soil nitrogen storage (SNS), and soil phosphorus storage (SPS)] were measured. The results showed that (1) the soil bulk density and clay content of different shelterbelts differed significantly in the horizontal direction, while the soil properties differed significantly in the vertical direction. (2) The shelterbelts had enhanced water retention and nutrient supply functions, and the soil water and nutrient reserves of the four-line pattern were higher than those of the five- and eight-line patterns (SMS = 237.44 mm; SCS = 544.93 g·m^-2; SNS = 953.72 g·m^-2; SPS = 859.04 g·m^-2). (3) The average tree height and DBH of the four-row shelterbelt were 30.06 m and 0.41 m, respectively. Additionally, the four-row shelterbelt had the maximum crop yield of 15.75 t·hm^-2. (4) Redundancy analysis showed that a close relationship existed between environmental factors and ecosystem functions in the different shelterbelts, soil characteristics were closely related to soil water and nutrient reserves, and vegetation attributes were negatively correlated with SNS and SPS. In conclusion, the four-line pattern demonstrated the strongest capacity for water and nutrient supply. The results of this study provide a sufficient theoretical basis for shelterbelt construction and ecological restoration in ecologically fragile areas.

Key words: farmland shelterbelt, soil properties, vegetation attribute, ecosystem function, farmland management

JI Mingxin, FENG Tianjiao, XIAO Huijie, XIN Zhiming, LI Junran, WANG Dong. Effects of different farmland shelterbelts on soil water and nutrient storage in the Hetao Irrigation District[J].Arid Zone Research, 2023, 40(8): 1268-1279.

Figures/Tables 7

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样地	树种分配	树高/m	林带长/m	树间间距	林龄/a	农田作物
4行	3行小美旱杨+1行沙枣	30.06	340	2.5 m×1.5 m	30	玉米
5行	4行二白杨+1行小美旱杨	23.85	340	2.0 m×1.5 m	33	玉米
8行	8行新疆杨	25.42	340	2.0 m×1.5 m	33	玉米

样地	防护林						农田
样地	树高/m	胸径/m	冠层大小/m²	树冠体积/m³	枝下高/m	FRBD /(g·cm^-2)	植被盖度/%	个体株高/cm	作物产量 /(t·hm^-2)
4行	30.06±0.49A	0.41±0.02B	8.70±1.07A	68.97±8.70A	1.82±0.41A	1.31±0.04A	85.73±0.81A	134.52±10.87A	15.75±0.99A
5行	23.85±0.71C	0.48±0.05B	4.47±0.59B	43.99±4.02B	1.09±0.58B	1.24±0.13A	86.13±1.15A	129.12±10.89A	9.29±1.09B
8行	25.42±0.82B	0.34±0.04A	6.91±0.92A	77.41±13.31A	2.02±0.21A	1.09±0.16A	84.27±0.46A	130.86±10.21A	15.64±0.81A

Effects of different farmland shelterbelts on soil water and nutrient storage in the Hetao Irrigation District

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