| Biology and Soil |
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| Responses of Nitraria tangutorum Branch Morphology to Increased Rainfall in Minqin, Gansu Province |
| ZHANG Jin-xin1, WU Bo1,2, ZHU Ya-juan1, LU Qi1,2, LI Yong-hua1 |
1.Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China；
2.Key Laboratory of Tree Breeding and Cultivation of the State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China |
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Abstract Under the background of global change, the variation of precipitation pattern might affect vegetation dynamics in arid zone. Nitraria tangutorum shrub, which is one of typical desert vegetation in Minqin County, Gansu Province, was chose to study the effect of precipitation variation on vegetation dynamics. The change pattern of morphological characteristics of N. tangutorum branches was examined under different simulated rainfall increase treatments (0%, 25%, 50%, 75% and 100% increasing of mean annual precipitation, respectively). Result showed that there was significant correlation among branch morphological indexes. The length of N. tangutorum branches in the 75% and 100% rainfall increase treatments was significantly greater than that in no rainfall increase treatment from June to September. The number of new leaves of N. tangutorum branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment only in August. In August and September, the basal diameter of the vegetative branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment. However, the number of mature leaves and the dry weight of vegetative branches were not significantly different for different rainfall increase treatments. The basal diameter of flower branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment from July to September. The number of mature leaves of flower branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment in July. Dry weight of flower branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment from June to August. Therefore, there is a certain inherent coordination among adaptive mechanisms of different morphological characteristics of N. tangutorum branches under different rainfall increase treatments.
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Received: 06 April 2011
Published: 20 May 2012
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2012, Vol. 32 
