西北干旱区藓类结皮覆盖下土壤多功能性特征及影响因子

doi:10.13866/j.azr.2024.05.09

Abstract

Abstract:

Biological soil crusts (BSCs) are the main active groundcover community in arid regions. BSCs can significantly affect the material cycle and energy exchange, improve the physical, chemical, and biological properties of surface soil, and influence the soil multifunctionality (SMF). Moss crust is an important type of BSCs. This study investigates the SMF variability of moss crust-covered and bare sand in the deserts of northwestern arid regions, and explored the main drivers of the variability. We analyzed eight crucial ecosystem function indicators. SMF was calculated by applying the mean method and factor analysis approach. We used the ordinary least square and structural equation modeling to explore the drivers of SMF changes. The results show that: (1) soil monofunctionality and SMF under moss crust cover were higher than those in bare sand (P<0.05). (2) The drivers of the SMF change in bare sand and under moss crust cover were very different. The main drivers of SMF in bare sand were aridity and soil water content, whereas the driver of SMF under moss crust cover was soil sand content (Sand). (3) The mean annual temperature had the largest indirect effect on changes in SMF for both soil in bare sand and under moss crust cover. Therefore, the development of moss crust significantly increased SMF and, in addition, modulated the relevant drivers of SMF. Our results are important for a deep understanding of the differences and drivers of SMF in desert soil with bare sand and under moss crust cover.

Key words: soil multifunctionality, northwest arid regions, moss crust, driving factor, structural equation modeling

LEI Feiya, LI Xiaoshuang, TAO Ye, YIN Benfeng, RONG Xiaoying, ZHANG Jing, LU Yongxing, GUO Xing, ZHOU Xiaobing, ZHANG Yuanming. Characterization of soil multifunctionality and its determining factors under moss crust cover in the arid regions of Northwest China[J].Arid Zone Research, 2024, 41(5): 812-820.

Figures/Tables 7

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References 49

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样点	经度/（°）	纬度/（°）	海拔/m	植被盖度	土壤类型	结皮盖度	结皮类型	土壤粒级分布/%			年均降水/mm	年均气温/℃
样点	经度/（°）	纬度/（°）	海拔/m	植被盖度	土壤类型	结皮盖度	结皮类型	粉粒	砂粒	石砾	年均降水/mm	年均气温/℃
S1	87.15417	45.3023	461.79	0.05	简育砂性土	0.74	藻-地-藓	4.94	67.09	27.98	91.50	8.82
S2	87.67692	45.2478	575.22	0.01	简育砂性土	0.84	藻-地-藓	4.61	83.08	12.31	101.03	8.48
S3	88.30511	45.2636	729.83	0.04	简育砂性土	0.85	藻-地-藓	1.94	95.25	2.81	125.50	7.65
S4	108.5659	38.8198	1391.35	0.18	钙积潜育土	0.43	藻-地-藓	2.03	91.14	6.83	209.00	8.67
S5	110.2118	39.0136	1250.04	0.01	简育砂性土	0.45	藻-地-藓	0.93	81.03	18.04	255.00	9.18
S6	103.8205	40.8864	1332.37	0.02	简育石膏土	<0.10	藻-地-藓	1.78	82.66	15.56	64.50	8.77
S7	108.9267	37.9791	1158.39	0.01	过渡性红砂土	<0.10	藻-地-藓	3.42	75.13	21.45	257.00	10.07
S8	104.8801	37.5025	1508.13	0.04	简育砂性土	0.23	藻-地-藓	0.97	88.95	10.07	146.15	9.50

	SOC	TN	TP	C:N	C:P	N:P	AN	AP	SMF1	SMF2
SMF1	0.832^**	0.701^**	0.614^**	0.240^*	0.293^**	0.218^*	0.784^**	0.752^**	1	0.994^**
SMF2	0.860^**	0.688^**	0.660^**	0.262^**	0.256^*	-0.254^*	0.796^**	0.762^**	0.994^**	1

Characterization of soil multifunctionality and its determining factors under moss crust cover in the arid regions of Northwest China

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