吉兰泰盐湖防护体系建立38 a以来土壤养分特征

doi:10.13866/j.azr.2023.05.07

Abstract

Abstract:

This study was established to evaluate the influence of the Jilantai Salt Lake protection system on soil nutrient accumulation. This is a comparative study of soil nutrient accumulation in different protection system types under the salt lake protection system (zones for fixing shifting sand, fencing dunes for grass recovery, preventing wind and stopping sand, and a forest for protecting the salt lake) using the method of representative investigation and laboratory analysis. The goal was to provide a theoretical basis for the management of shelter forest in Jilantai Salt Lake. Our results showed the following: (1) The increases in soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), available nitrogen (AN), and available phosphorus (AP) contents were in the range of 0.45-1.92 g·kg^-1, 0.03-0.58 g·kg^-1, 0.15-0.43 g·kg^-1, 1.33-13.31 mg·kg^-1, and 0.12-12.94 mg·kg^-1, respectively. Soil depth, protection system type, and their interaction had significant positive effects on the increase in the soil SOC, TN, TP, and AP contents. (2) Establishment of the salt lake protection system had a significant effect on soil nutrients at a depth of approximately 0-100 cm, and the soil depth, protection system type, and their interaction had a significant impact on soil TP relative interaction intense (RII_TP), AN relative interaction intense (RII_AN), AP relative interaction intense (RII_AP), and total RII. (3) Nutrient restoration index showed that soil nutrients improved to different degrees in different protection system types of the salt lake protection system, and their nutrient restoration indexes of zones for fixing shifting sand, fencing dunes for grass recovery, preventing wind and stopping sand and a forest for protecting the salt lake were 7.83%, 37.72%, 185.12%, and 252.36%, respectively. This study showed that, in the 38 years since its establishment, the salt lake protection system could effectively promote soil nutrient accumulation and accelerate soil nutrient restoration in the salt lake area, benefitting the ecological restoration and reconstruction around Jilantai Salt Lake.

Key words: vegetation restoration, nutrient accumulation, relative interaction intense, protection system type, salt lake protection system

WEI Yajuan, LIU Meiying, XIE Yunhu, LI Xing. Characteristics of soil nutrient accumulation after 38 years of the Jilantai Salt Lake protection system[J].Arid Zone Research, 2023, 40(5): 747-755.

Figures/Tables 7

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References 30

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防护体系类型	建植方式	恢复年限/a	优势种	灌木			草本		盖度/%	凋落物/（g·m^-2）
防护体系类型	建植方式	恢复年限/a	优势种	株高/cm	冠幅/m²	密度/（株·hm^-2)	株高/cm	密度/（株·m^-2）	盖度/%	凋落物/（g·m^-2）
流沙固阻带	-	-	沙米、白刺	-	-	-	5.65	3.12	<10	0
封沙育草带	自然恢复	-	白刺为主，其他植被有芦苇、苦豆子和披针叶野决明。	30.61	9.68	25.95	48.23	20.00	20	133.25
防风阻沙带	人工植苗	36	沙枣、梭梭、沙拐枣、花棒	295.33	19.82	1666.7	15.20	6.00	58	310.01
盐湖防护林带	人工植苗	36	沙枣、花棒、梭梭、柽柳	259.00	14.48	1111.1	28.00	9.62	45	223.14

因素	指标	SOC	TN	TP	AN	AP
防护体系类型	F	55.01	8.56	10.44	2.21	150.72
防护体系类型	P	0.000^***	0.000^***	0.000^***	0.102	0.000^***
土层深度	F	70.18	52.33	136.97	35.73	56.76
土层深度	P	0.000^***	0.000^***	0.000^***	0.000^***	0.000^***
防护体系类型×土层深度	F	9.1	3.35	2.94	1.52	7.25
防护体系类型×土层深度	P	0.000^***	0.002^**	0.005^**	0.160	0.000^***

因素	指标	RII_SOC	RII_TN	RII_TP	RII_AN	RII_AP	RII_总
防护体系类型	F	1.92	1.51	26.01	28.29	165.13	59.07
防护体系类型	P	0.141	0.228	0.000^***	0.000^***	0.000^***	0.000^***
土层深度	F	18.15	58.70	107.67	25.00	6.81	56.53
土层深度	P	0.000^***	0.000^***	0.000^***	0.000^***	0.000^***	0.000^***
防护体系类型×土层深度	F	10.03	5.20	6.62	10.71	13.23	10.03
防护体系类型×土层深度	P	0.000^***	0.000^***	0.000^***	0.000^***	0.000^***	0.000^***

防护体系类型	SOC	TN	TP	AN	AP	平均值
流沙固阻带	11.15	12.46	2.89	3.32	9.35	7.83
封沙育草带	89.74	13.86	6.21	11.73	67.05	37.72
防风阻沙带	86.86	275.61	17.07	16.42	529.63	185.12
盐湖防护林带	109.87	800.94	30.34	68.28	1394.42	252.36

Characteristics of soil nutrient accumulation after 38 years of the Jilantai Salt Lake protection system

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