Effects of different years of returning farmland on soil moisture and species diversity in Minqin Qingtu Lake area
Received date: 2021-04-22
Revised date: 2021-08-11
Online published: 2022-03-30
Using the spatial instead of temporal method, we investigated the characteristics of soil moisture change and vegetation succession characteristics across different years of abandoned land (returned fields 1 a, 2 a, 4 a, 8 a, 13 a, 20 a, 30 a, 40 a, and CK) in the Qingtu Lake area of Minqin. As the period of abandoned land increased, the soil water content first decreased, then increased and gradually stabilized. Additionally, as the period of abandoned land increased, the number of individuals, number of groups and Margalef richness index tended to decline; the Shannon diversity index and Pielou evenness index increased first, then decreased and gradually stabilized, whereas the Simpson dominance index only minorly changed before stabilizing. Moreover, as the period of returning farmland increased, the plant community followed a succession process: Kochia scoparia→Halogeton arachnoideus→Setaria viridis→Peganum nigellastrum→Suaeda microphylla→Lycium ruthenicum→Reaumuria soongarica→Kalidium foliatum. Overall, the Simpson dominance index and soil water content in the 0-20 cm soil layer showed a highly significant negative correlation, whereas the Shannon diversity index and soil water content in the 0-20 cm soil layer showed a highly significant positive correlation; however, there was no significant correlation with soil water content in the 20-40 cm soil layer. Additionally, there was no significant correlation between group number, Margalef richness index, Pielou evenness index, and soil water content. As such, natural vegetation succession in arid areas depends on the soil water content in the 0-20 cm soil layer.
WANG Jia,TIAN Qing,WANG Lide,HE Hongsheng,SONG Dacheng,GUO Chunxiu . Effects of different years of returning farmland on soil moisture and species diversity in Minqin Qingtu Lake area[J]. Arid Zone Research, 2022 , 39(2) : 605 -614 . DOI: 10.13866/j.azr.2022.02.27
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