黄土丘陵区带状柠条锦鸡儿林地深层土壤干化及根系分布

doi:10.12118/j.issn.1000-6060.2022.373

Abstract

Abstract:

To explore the deep water status and root distribution of artificial rainfed planting Caragana korshinskii forest in southern Ningxia of China, the 20-year rainfed strip planting C. korshinskii forest was chosen as the research object, a similar farmland for control was selected, and a 0-1000-cm depth of soil moisture, vertical distribution of root, and correlation were analyzed. Soil moisture and root systems were investigated in the center of the C. korshinskii and farmland. The soil drying method was used to determine the soil moisture content, and the root-drill sampling method was used to investigate the root system. The results showed the following: (1) Deep soil desiccation was determined in 0-1000 cm soil layers for the 20-year C. korshinskii forest. Soil water content for the interband and intra-band of C. korshinskii forest was lower than farmland. Compared with the interband soil water, the intra-band soil moisture content was reduced by 1.46% in the 0-1000 cm soil layer. (2) In the range of 300-1000 cm soil layer, the 20-year artificial C. korshinskii appeared in different water deficiency states and soil desiccation. Soil moisture availability for the interband and intra-band were 0.21 and 0.02 and the soil water supply coefficient were 0.49 and 0.33, respectively. (3) C. korshinskii roots mainly distributed in the 0-80 cm soil layer, accounting for 46.33% and 45.56% of the total root weight for interband and intra-band dried roots, respectively. The root surface area density accounted for 66.58% (interband) and 63.51% (intra-band) of the total root surface area density, and root length density accounted for 59.54% (interband) and 58.45% (intra-band) of the total root length density. This study has positive significance for in-depth understanding of root systems, water content, and sustainable management of artificial vegetation in semiarid loess areas.

Key words: Caragana korshinskii forest, soil moisture availability, soil drying degree, root distribution

YU Xiaoyan, WANG Xing, LYU Wen, GAO Yuankang, WANG Yongqiang, WANG Yanchao. Deep soil desiccation and root distribution of belted Caragana korshinskii forest in loess hilly region[J].Arid Land Geography, 2023, 46(5): 753-762.

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References 30

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土壤水分有效性分级	土壤含水量范围	土壤水分有效性/%
富余水	>田间持水量	>19.36
易效水	田间持水量的80%~100%	15.49~19.36
中效水	田间持水量的60%~80%	11.62~15.49
难效水	土壤凋萎湿度~田间持水量的60%	7.12~11.62
无效水	<土壤凋萎湿度	<7.12

土层深度/cm	柠条锦鸡儿林地					农田
土层深度/cm	平均土壤体积含水率/%	水分亏缺度/%	亏缺程度	储水量 /mm	占农田储水量/%	平均土壤体积含水率/%	水分亏缺度/%	亏缺程度	储水量 /mm
300~440	6.16b	46.79a	中度亏缺	32.79c	57.61	11.67b	-0.84a	无	56.92c
440~800	7.09b	38.72a	中度亏缺	36.38b	47.10	15.83a	-36.86b	无	77.24b
800~1000	10.09a	12.77b	轻度亏缺	48.83a	60.73	16.48a	-42.42b	无	80.40a
平均	7.78	32.76	中度亏缺	39.33	54.99	14.66	-26.71	无	71.52

土层深度 /cm	土壤水分有效性		土壤供水系数
土层深度 /cm	带间	带内	带间	带内
0~80	0.67±0.47a	0.26±0.11a	0.86	0.69
80~200	0.38±0.26ab	0.14±0.07ab	0.75	0.51
200~440	0.02±0.08bc	-0.23±0.08c	0.37	0.03
440~840	-0.12±0.13c	-0.14±0.08c	0.10	0.08
840~1000	0.13±0.09bc	0.06±0.08b	0.38	0.33
平均	0.21	0.02	0.49	0.33

样地	平均干燥化指数/%	土壤干燥强度	极度干燥层/cm	严重干燥层/cm	轻度干燥层/cm	无干燥层/cm	土壤干层/cm
带间	-0.13	极度干燥化	320	380	0	0	700
带内	-0.37	极度干燥化	500	200	0	0	700

土层深度 /cm	带间根干重/g·m^-3	带间逐层占总根重比例/%	带内根干重 /g·m^-3	带内逐层占总根重比例/%
0~80	1383.36a	46.33	1397.19a	45.56
80~200	835.99b	28.00	871.22b	28.41
200~440	577.23c	19.33	583.00c	19.01
440~840	189.09d	6.34	189.43d	6.18
840~1000	0.00	0.00	26.00e	0.86
平均值	119.43	-	122.70	-

Deep soil desiccation and root distribution of belted Caragana korshinskii forest in loess hilly region

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参数	土层深度	根表面积密度	根长密度	根干重	水分含量	干燥化程度	水分有效性	供水系数
土层深度	1.00
根表面积密度	-0.53^**	1.00
根长密度	-0.51^**	0.99^**	1.00
根干重	-0.73^**	0.93^**	0.90^**	1.00
水分含量	-0.10	0.51^**	0.46^*	0.60^**	1.00
干燥化程度	-0.10	0.51^**	0.46^*	0.60^**	1.00^**	1.00
水分有效性	-0.10	0.51^**	0.46^*	0.60^**	1.00^**	1.00^**	1.00
供水系数	0.01	0.36	0.32	0.46^*	0.95^**	0.95^**	0.95^**	1.00