Effect of Artificial Simulated Rainfall on Physiological and Ecological Characteristics of Nitraria tangutorum

doi:10.7522/j.issn.1000-694X.2018.00007

Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (4): 747-755.DOI: 10.7522/j.issn.1000-694X.2018.00007

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Effect of Artificial Simulated Rainfall on Physiological and Ecological Characteristics of Nitraria tangutorum

Zhang Jinxin^1,4, Zhang Jingbo^2,3, Lu Qi², Wu Bo², Zhu Yajuan², Li Yonghua²

1. Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China;
2. Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China;
3. Experimental Center of Desert Forestry, Chinese Academy of Forestry, Beijing 100091, China;
4. Key Laboratory of Tree Breeding and Cultivation of the State Forestry Administration, Beijing 100091, China

Received:2017-10-26 Revised:2018-01-16 Online:2018-07-20 Published:2018-11-06

Abstract

Abstract: Under the background of global change, the variation of precipitation pattern might affect vegetation dynamics in arid zone. Nitraria tangutorum shrub land, which is one of the typical desert vegetation in Minqin County, Gansu Province, was chose to study the effect of precipitation variation on vegetation dynamics. Through the successive four years of artificial rain enrichment scenario, soil moisture of the N. tangutorum shrub land, leaf traits index and morphological characteristics of branches of N. tangutorum were measured in 2011 under different simulated rainfall gradients (increased 0%, 25%, 50%, 75% and 100% of mean annual precipitation, respectively). The cumulative effects of different treatments on the physiological and ecological characteristics of N. tangutorum were studied. The results showed that soil moisture of the N. tangutorum shrub land shallow layer was obvious improved, soil moisture of 10 cm layer in the increased 75% and 100% rainfall treatment was significantly increased;leaf water potential, net photosynthetic rate (P_n), transpiration rate (T_r), stomatal conductance (G_s), specific leaf area (SLA), mass-based leaf nitrogen (N_mass), and the growth of the length and basal diameter of N. tangutorum branch were increased with increasing rainfall, leaf water potential and indexes of leaf functional traits on the first day after the 100% rainfall treatment were significantly greater than that in the increased 0% rainfall treatment; SLA and N_mass were increased with increasing rainfall, and not reached significant level; The growth of the length and basal diameter of N. tangutorum branch were increased with increasing rainfall, and in the increased 75% and 100% rainfall treatment was significantly greater than that in the increased 0% rainfall treatment, their differences were 64.57%、66.63% and 48.71%、67.54%, respectively. It was suggest that N. tangutorum through adaptive strategies of internal physiological and external forms to promote its growth.

Key words: artificial simulated rainfall, physiological ecology, adaptive strategy, Nitraria tangutorum

CLC Number:

Q948.11

Zhang Jinxin, Zhang Jingbo, Lu Qi, Wu Bo, Zhu Yajuan, Li Yonghua. Effect of Artificial Simulated Rainfall on Physiological and Ecological Characteristics of Nitraria tangutorum[J]. Journal of Desert Research, 2018, 38(4): 747-755.

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Effect of Artificial Simulated Rainfall on Physiological and Ecological Characteristics of Nitraria tangutorum

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