Effects of grazing management on the degradation of <i>Ulmus Pumila</i> open forest in Otindag Sandy Land

Xueling, 姚雪玲 Yao; Long, 李龙 Li; Feng, 王锋 Wang; Shurun, 刘书润 Liu; Bo, 吴波 Wu; Xiujiang, 郭秀江 Guo

doi:10.5846/stxb201901040038

Cited by 1 publication

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“…The zonal soil is mainly sandy chestnut soil and aeolian sandy soil [22]. The most typical natural top-level vegetation community in Hunshandak Sandy Land is Ulmus pumila L. sparse forest grassland (Figure 1), which is a nonzonal hidden vegetation type [23]. The zonal vegetation of Hunshandak Sandy Land includes meadow steppe, steppe and desert steppe [24].…”

Section: Introductionmentioning

confidence: 99%

“…However, in recent years, the phenomenon of overgrazing in U. pumila sparse forest grassland has been very common, the stocking rate has exceeded a reasonable level by 20% and the grassland has been seriously degraded [30]. Grassland degradation caused by overgrazing has prevented the natural regeneration of the U. pumila population, causing many shrub deaths and significantly reducing herb coverage, plant species and the proportion of perennial herbs [23].…”

Section: Introductionmentioning

confidence: 99%

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Plant Diversity Responses of Ulmus pumila L. Communities to Grazing Management in Hunshandak Sandy Land, China

Huang,

He,

Zhao

et al. 2023

Diversity

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Biodiversity is sensitive to climate change and human activity. Grazing management practices have a profound impact on plant species–genetic diversity in grassland and woodland communities. In this study, we explored the responses of species and genetic diversity to grazing in Ulmus pumila L. communities in the Hunshandak Sandy Land, analyzed the relationship between species and genetic diversity, and revealed the effects of climate factors on them. We found that the dominant species were Spiraea trilobata, Caragana microphylla and Artemisia intramongolica in U. pumila communities. Plant species richness in the banned grazing (BG) and seasonal grazing (SG) communities was significantly higher than that in the delayed grazing (DG) community. Plant Simpson’s diversity index showed a downward trend with increasing grazing duration. There was no difference in allelic richness in nuclear DNA (nrDNA) of U (U. pumila) and chloroplast DNA (cpDNA) of NU (other dominant species besides U. pumila) among grazing management types. The expected heterozygosity of U in nrDNA and cpDNA was significantly affected by grazing management, and the trend was BG > SG > DG. The genetic diversity of U was lower than that of NU. The genetic diversity characteristics of U in cpDNA were lower than those in nrDNA. The analysis of molecular variance (AMOVA) showed that 98.08% of the variation in U and 95.25% of the variation in NU was attributed within populations and the differences within grazing management types were 13.35% in U and 24.08% in NU (p < 0.001). The species richness of communities was positively correlated with the genetic diversity of U, NU and all dominant species (U + NU) in communities. The nineteen climatic variables together explained 94.24% and 79.08% of the total variation in U and NU genetic and species diversity. The mean temperature of the warmest quarter and temperature seasonality were the main factors affecting genetic diversity (p = 0.046; 0.01), while the maximum temperature of the warmest month was the main factor affecting species diversity (p = 0.05).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%