桂西北石漠化地区几种植物光合潜力影响因素分析

通过对桂西北石漠化地区不同植物叶绿素含量、SPAD值、根际土壤水分、土壤有机质含量、叶面积指数等光合潜力影响因素的比较和相关性分析，为石漠化地区生态恢复重建优良先锋植物的选择提供科学依据。结果表明：土壤有机质含量与根际土水分含量、SPAD值与叶绿素含量呈显著正相关。不同植物的生理特性差异较大，其光合潜力的影响因素也有较大差异。构树叶片的叶绿素含量最高，叶面积指数也较大，适应性强，枫树、黄荆、青檀和阴香也是桂西北地区常见的乡土树种，具有良好的生态经济效益，均可作为石漠化生态恢复的先锋植物使用。

Influencing Factors Analysis of the Plant Photosynthetic Potential in Karst Rocky Desertification Areas of Northwest Guangxi

In order to provide scientific basis for excellent pioneer plants selection of karst stony decertifi- cation areas＇ ecological restoration and reconstruction in northwest of Guangxi, the influencing factors of photosyn- thetic potential, such as chlorophyll content, SPAD value, rhizosphere soil moisture content, soil organic matter content, leaf area index, etc. were compared and correlation analyzed. The results show that there is a significant positive correlation among rhizosphere soil organic matter content, soil moisture content, SPAD value and chloro- phyll content. Physiological characteristics of different plants are quite different so photosynthetic potential influen- cing factors of different plants are also quite different. The chlorophyll content of Broussonetia papyrifera leave is the higher than that of other plants, and the leaf area index of it is large, and the adaptability of it is relatively strong. Liquidambar formosanas, Vitex negundos, Pteroceltis tatarinowiis and Cinnamomum burmanniis are common native species in northwest of Guangxi, they have good ecological and economic benefits, so they may be used as pioneer plants of karst rocky desertification ecological restoration.