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

干旱区地理 ›› 2023, Vol. 46 ›› Issue (5): 753-762.doi: 10.12118/j.issn.1000-6060.2022.373

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

于晓燕¹(),汪星¹,吕雯^2,³(),高元亢¹,王永强¹,王雁超¹

1.宁夏大学农学院，宁夏银川 750021
2.宁夏大学生态环境学院，宁夏银川 750021
3.宁夏大学西北退化生态系统恢复与重建教育部重点实验室，宁夏银川 750021

收稿日期:2022-07-24 修回日期:2022-11-18 出版日期:2023-05-25 发布日期:2023-06-05
通讯作者: 吕雯（1979-），女，博士，副研究员，主要从事水土保持、水土资源高效利用方面研究. E-mail: lvwen@nxu.edu.cn
作者简介:于晓燕（1998-），女，硕士研究生，主要从事水土保持与荒漠化防治研究. E-mail: nxuyuxy@163.com
基金资助:
国家自然科学基金项目(32260422);国家自然科学基金项目(32060301);宁夏自然科学基金资助项目（优秀青年项目）(2022AAC05019);宁夏自然科学基金项目(2021AAC03042)

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

YU Xiaoyan¹(),WANG Xing¹,LYU Wen^2,³(),GAO Yuankang¹,WANG Yongqiang¹,WANG Yanchao¹

1. School of Agricultural, Ningxia University, Yinchuan 750021, Ningxia, China
2. School of Ecological Environment, Ningxia University, Yinchuan 750021, Ningxia, China
3. Key Laboratory for Restoration and Reconstruction of Degraded Ecosystems in Northwestern China of Ministry of Education, Ningxia University, Yinchuan 750021, Ningxia, China

Received:2022-07-24 Revised:2022-11-18 Online:2023-05-25 Published:2023-06-05

摘要/Abstract

摘要：

针对黄土丘陵区带状柠条锦鸡儿人工林地根系、土壤水分特征及深层土壤干化研究薄弱问题，以宁夏南部山区20 a雨养带状人工柠条锦鸡儿林地为研究对象，选取相似的旱作农田为对照，对0~1000 cm深度土壤水分、柠条锦鸡儿根系垂直分布及其相关性进行分析。结果表明：（1） 20 a人工柠条锦鸡儿林地0~1000 cm深度土壤干化，柠条锦鸡儿林地带内和带间土壤水分含量低于农田；0~1000 cm土层带内土壤水分含量较带间降低1.46%。（2）在300~1000 cm土层范围内，20 a人工柠条锦鸡儿林地出现了不同的亏缺程度与干燥化程度，带间、带内水分有效性分别为0.21和0.02，供水系数平均值分别为0.49和0.33。（3）柠条锦鸡儿林地根系主要集中在0~80 cm土层，0~80 cm土层带间、带内根干重分别占总根重的46.33%和45.56%，根表面积密度分别占总根表面积密度的66.58%和63.51%，根长密度分别占总根长密度的59.54%和58.45%。该研究对于深入了解半干旱黄土区人工柠条锦鸡儿林地根系、水分具有积极意义。

关键词: 柠条锦鸡儿林地, 土壤水分有效性, 土壤干燥化程度, 根系分布

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

于晓燕, 汪星, 吕雯, 高元亢, 王永强, 王雁超. 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[J]. 干旱区地理, 2023, 46(5): 753-762.

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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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	-

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

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