• 研究报告 •

新疆西天山峡谷不同坡向野核桃幼苗种群动态及生长分析

1. (1伊犁师范学院化学与生物科学学院, 新疆伊宁 835000; 2东北师范大学草地科学研究所植被生态科学教育部重点实验室, 长春 130024)
• 出版日期:2014-10-10 发布日期:2014-10-10

Population dynamics and growth of Juglans cathayensis seedlings of different slope aspects in the west Tianshan valley in Xinjiang, China.

ZHANG Wei1,2, JIA Feng－qin1, NA Sen－bate1, YANG Yun－fei2**

1. (1School of Chemistry and Bioscience, Yili Normal College, Yining 835000, Xinjiang, China; 2Institute of Grassland Science, Northeast Normal University, Key Laboratory of Vegetation Ecology, Ministry of Education, Changchun 130024, China)
• Online:2014-10-10 Published:2014-10-10

Abstract:

On the basis of the non-destructive determination of seedling age and survey one by one in plots, the static life table of Juglans cathayensis of different slope aspects in the west Tianshan valley in Xinjiang was established, and the quantitative characteristics of seedling height and the growth patterns were analyzed. Results showed that the seedling life expectancy of different slope aspects was longest in the 1st age class, being 2.018 on the sunny slope and 1.766 on the shady slope. The seedling life expectancy was generally higher on the sunny slope than on the shady slope in the 1st to 6th age classes. The proportions of the seedling population number of different slope aspects were largest in the 1st age class, being 39.7% on the sunny slope and 44.2% on the shady slope. The mortality rates of the seedlings were highest in the 3rd age class, with 82.0% on the sunny slope and 78.3% on the shady slope. The age structure of the seedling population was of an expanding type, and the survival curve tended to be of Deevey-Ⅱ type regardless of slope aspects. The seedlings could survive only 3.3% on the sunny slope and 1.1% on the shady slope from 1st to 7th age class. The seedling heights followed an allometry of the exponent function with the age classes, and the growth rate (b value) of the model was substantially the same regardless of slope aspects.