元谋干热河谷一种景观树种羊蹄甲的光合特性研究.pdf

Botanical Research 植物学研究, 2016, 5(2), 47-54 Published Online March 2016 in Hans. /journal/br /10.12677/br.2016.52008 Study on the Photosynthetic Characteristics of Bauhinia blakeana—A Kind of Landscape Trees in Yuanmou Dry-Hot Valleys Zhixian Pan, Xuewen Yue, Chunxue Wang, Jiancha Li, Haidong Fang* Institute of Tropical Eco-Agricultural Sciences, Yunnan Academy of Agricultural Sciences, Yuanmou Yunnan Received: Feb. 21st, 2016; accepted: Mar. 9th, 2016; published: Mar. 15th, 2016 Copyright ? 2016 by authors and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract In order to study the photosynthetic characteristics of Bauhinia blakeana, the photosynthetic rate, stomatal conductance and its corresponding environmental factors were measured. Photosyn- thetic characteristics of Bauhinia blakeana, a kind of greening tree species in Yuanmou County, were measured by using TPS-1 portable photosynthetic measurement system (produced by PPsystems Company in the British). The results showed that the daily variation of net photosyn- thetic rate of Bauhinia blakeana showed bimodal curve. The factors of photosynthetic active radi- ation (PAR), transpiration rate (Tr), intercellular CO2 concentration (Ci), atmospheric CO2 concen- tration (Ca), stomatal conductance (Gs) and temperature (T) impacted on the net photosynthetic rate of Bauhinia blakeana. The average value of light use efficiency was 0.03 mmol?mol?1, and wa- ter use efficiency was 2.061 mmol?mol?1. Bauhinia blakeana had stronger adaptation in Yuanmou dry-hot valleys. Keywords Bauhinia blakeana, Photosy