极端干旱与氮添加对半干旱沙质草地物种多样性、叶性状和生产力的影响

doi:10.13866/j.azr.2020.06.23

Abstract

Abstract: We examined the effects of extreme drought (rain reduction by 60% and drought for 60 days) and nitrogen addition (20 g·m- 2 ·a- 1) on species diversity, productivity, and leaf trait in Horqin Sandy Land. Results show that changes in water and nitrogen altered important values of dominant species, such that which the important values of Echinops gmelini and Artemisia scoparia increased significantly under short-term extreme drought and nitrogen addition treatment. Short-term extreme drought had a significant effect on plant height (H), leaf nitrogen content (LNC), and aboveground biomass. Following rain reduction by 60%, H decreased, while LNC increased. Aboveground biomass decreased, following rain reduction by 60% and drought for 60 days. There was no significant difference in species diversity, specific leaf area (SLA), leaf day matter content (LDMC), and leaf carbon content (LCC) between drought treatments. Short-term nitrogen addition significantly changed the leaf traits and aboveground biomass. Following the addition nitrogen, SLA, and LNC increased, while LDMC decreased. There was no significant difference in plant diversity. Interaction between extreme drought and nitrogen addition had no significant effect on species diversity, leaf traits, and aboveground biomass. Correlation and regression analysis showed that species diversity, SLA, LDMC, LCC, and LNC did not significantly correlate with biomass, while H was positively correlated with aboveground biomass following nitrogen addition. The annual dominant plant communities in semiarid sandy grassland adapt to extreme drought and nitrogen deposition by changing key traits of dominant species, in which H has a greater impact on grassland productivity

Key words: extreme drought, nitrogen addition, species diversity, leaf functional trait, productivity

SUN Yi-mei, TIAN Qing, LYU Peng, GUO Ai-xia, ZHANG Sen-xi, ZUO Xiao-an. Effects of extreme drought and nitrogen addition on species diversity,leaf trait, and productivity in a semiarid sandy grassland[J].Arid Zone Research, 2020, 37(6): 1569-1579.

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Effects of extreme drought and nitrogen addition on species diversity,leaf trait, and productivity in a semiarid sandy grassland

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