[Plant Diversity Changes and Its Driving Factors of Abandoned Land at Different Restoration Stages in the Middle of the Qinling Mountains].
Huan Jing Ke Xue
; 45(2): 992-1003, 2024 Feb 08.
Article
in Zh
| MEDLINE
| ID: mdl-38471937
ABSTRACT
The process of vegetation restoration is often accompanied by significant changes in aboveground plant diversity. To explore the driving mechanism of litter nutrient-soil nutrient-enzyme activity stoichiometry on aboveground vegetation change is of great importance for maintaining regional biodiversity conservation and ecological stability. Taking typical abandoned farmland of different restoration years ï¼1ï¼ 8ï¼ 16ï¼ 31ï¼ and 50 aï¼ in the Qinling Mountains as the research objectï¼ the variation characteristics of plant community diversity during vegetation restoration were analyzed through field investigation. Litter nutrientsï¼ soil nutrientsï¼ and the activities of five extracellular enzymesï¼ including ß-1ï¼4-glucosidase ï¼BGï¼ï¼ cellobiohydrolase ï¼CBHï¼ï¼ ß-1ï¼4-N-acetylglucosaminidase ï¼NAGï¼ï¼ leucine aminopeptidase ï¼LAPï¼ï¼ and acid phosphatase ï¼APï¼ï¼ were determined. The characteristics of litter nutrientsï¼ soil nutrientsï¼ and enzyme stoichiometric ratios during vegetation restoration and the driving mechanism of plant diversity changes were discussed. The results showed that the plant community diversity index firstly decreased and then increased with the increase in vegetation restoration yearsï¼ and the minimum was reached at 16 years after restoration. The results of principal component analysis showed that there were significant differences between total plant community diversity index and litter-soil-enzyme stoichiometric characteristics in different years of vegetation restoration. The plant community diversity index had a strong positive correlation with litter Câ¶P ratio and litter Nâ¶P ratio but had a negative correlation with soil enzyme Câ¶P ratio ï¼EEA Câ¶Pï¼. The results of redundancy analysis showed that soil EEA Câ¶P had the highest explanation rate of plant diversity changes during vegetation restoration ï¼25.93%ï¼ï¼ followed by soil TP ï¼5.94%ï¼ï¼ which was the key factor regulating plant diversity changes. In conclusionï¼ plant species and quantity increased significantly in abandoned farmland in the middle part of the Qinling Mountains at the late stage of vegetation restoration. Changes in the soil environment affected microbial metabolic activities and thus changed enzyme activities. Litter-soil-soil extracellular enzymes affected the community environment and plant diversity through feedback and regulation. EEA Câ¶P and TP were the main driving factors of aboveground plant diversity change during vegetation restoration.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Plants
/
Biodiversity
Country/Region as subject:
Asia
Language:
Zh
Journal:
Huan Jing Ke Xue
/
Huanjing Kexue
Year:
2024
Document type:
Article
Affiliation country:
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