中文摘要：

为了解国家Ⅱ级渐危植物新疆野核桃不同年龄幼苗的数量组成及生长特性，在野核桃自然保护区不同坡向上设置4个2-hm^2样地，应用相邻格子样方法对野核桃幼苗进行逐株调查，分析了野核桃幼苗种群的数量组成、基径和株高的生长特征及各性状间的生长关系．结果表明：阳坡、半阳坡、阴坡和半阴坡野核桃1龄幼苗均较丰富，1～3龄幼苗数量均占绝对优势，不同坡向野核桃幼苗种群均呈增长型年龄结构．各坡向野核桃1龄幼苗平均5．7％可存活到4龄，平均1．7％可以存活到7龄．3龄是野核桃幼苗数量的一个转折点，幼苗种群在生活史中采用的是r对策．野核桃幼苗的基径和株高在3龄前生长缓慢，3龄后加快生长；基径平均生长速率为3．6mm·a^-1，按阴坡、阳坡、半阴坡、半阳坡顺序减小；株高平均生长速率为9．0cm·a^-1，按阳坡、半阳坡、半阴坡、阴坡顺序减小．不同坡向野核桃幼苗的基径与株高均随年龄的增加呈指数函数生长，株高与基径呈幂函数异速生长，幼苗各性状间的生长快慢可通过函数的性质和参数反映出来．

英文摘要：

For grasping the composition and growth characteristics of seedling populations of Juglans cathayensis, a national grade 11 endangered plant, four 2-hm2 plots were set up at different slope aspects in Wild Walnut Natural Conservation Area of Xinjiang, China. Adjacent lattice method was used to survey J. cathayensis seedlings. The relationships between the number, basal diameter and plant height of J. cathayensis seedling populations were analyzed. The results showed that seedlings at 1 st age were more abundant on sunny, semi-sunny, shady and semi-shady slopes. The number of seedlings was predominant at lst-3rd age. Seedling populations at different slope aspects showed an expanding age structure. 5.7% of 1st age seedlings could survive to 4th age, and 1.7% could survive to 7th age. The number of J. cathayensis seedlings had a critical turning point at the 3rd age. The seedlings of J. cathayensis were considered as r-strategists in their lives. The basal diameter and plant height of seedlings were slow-growing before 3rd age and fast-growing after 3rd age. Average growth rate of basal diameter was 3.6 mm · a^-1 and decreased in the order of shady slope, sunny slope, semi-shady slope and semi-sunny slope. Average growth rate of plant height was 9.0 cm · a^-1 and decreased in the order of sunny slope, semi-sunny slope, semi-shady slope and shady slope. Basal diameter and plant height of seedlings exponentially increased with the increase of age. The relationships between plant height and basal diameter showed power function. Growth rates of seedling traits could be renected by the properties and parameters of functions.