Interaction of extreme drought and insect herbivores on grassland community is affected by drought pattern

Author:

Luo Ye12,Ke Yuguang12,Wang Hongqiang12,Xu Chong12,Gu Qian3,Yu Qiang3,Smith Melinda D4ORCID,Madrimov Rajabboy5,Samatov Nuriddin56,Yang Wei7,Wu Honghui12

Affiliation:

1. State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences , Beijing 100081 , China

2. Key Laboratory of Arable Land Quality Monitoring and Evaluation, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences , Beijing 100081 , China

3. School of Grassland Science, Beijing Forestry University , Beijing 100083 , China

4. Department of Biology and Graduate Degree Program in Ecology, Colorado State University , Fort Collins, CO 80523 , USA

5. Research Institute of Environment and Nature Conservation Technologies of the Ministry of Ecology, Environmental Protection, and Climate Change of the Republic of Uzbekistan , Tashkent 100043 , Uzbekistan

6. Institute of Microbiology of the Academy of Sciences , Tashkent 100128 , Uzbekistan

7. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences , Beijing 100081 , China

Abstract

Abstract Extreme drought and insect herbivores can affect plant community non-independently, and their interaction may be influenced by drought pattern. However, few studies have explored the interaction on plant community structure, and no study has investigated whether the interaction is affected by drought pattern. We explored the interaction of different extreme drought patterns and insect herbivores with a manipulated experiment in a semiarid grassland. There were three treatments for drought: control—ambient precipitation; chronic drought—66% precipitation reduction in the growing season (May–August); intense drought—completely exclusion of rain events from June to July. Herbivores removal and present treatments were imposed within each drought treatment. We found that although herbivores had no significant effects on the impacts of droughts on total species richness, it alleviated the impacts of chronic drought on total cover, and the alleviating role decreased under intense drought. Comparing with intense drought, more increasing of grass cover led to more alleviation under chronic drought associated with the decrease of forb which has low leaf carbon and dry matter content, along with high starch, calcium, magnesium and manganese concentration. These results indicate that the interaction of drought and herbivores is affected by drought pattern, and the changes in leaf traits that reduce herbivores feeding in grass might alleviate the impact of drought on grassland.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Publisher

Oxford University Press (OUP)

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