秦岭山地竹林开花后的自然更新

本文从五个方面对秦岭竹林开花后的自然更新恢复过程进行了讨论,结果表明:1.在自然状态下种子落地一月内实生苗地上和地下生长长度为1:3,当月和当年展叶的多少与该竹的分布海拔和种子落地时间呈正相关。2.实生苗的分蘖,低海拔的当年即可分蘖,而海拔1500米以上的当年则不能分蘖。3.分蘖苗发笋从3月始可延续到9月份,各季节发笋的多少与海拔和竹种有关,各代分蘖苗发笋的时间与先一代分蘖苗发出的时间有关。4.各竹在开花后第5～6年逐渐恢复其本身的生物学特性。5.高生长和秆柄增长呈指数函数增长,幼竹地径和鞭径增长呈直线函数增长,各竹的生物学曲线巴山木竹为,箭竹为,华桔竹为

A STUDY ON NATURAL REGENERATION OF FLOWERING BAMBOO FORESTS IN QINGLING MOUNTAIN

This paper discusses natural regeneration process of flowering bamboo forests from five aspects. The results show; 1, At natural condition, when seedlings grow in the month after seeds falling, the ratio of the length in growth above ground and underground is 1:3. The numbers of expanding leaves of the month and the year after seeds falling may be positive related with the distributing elevation and the time of seeds falling. 2. The seedlings in lower level can tiller at the year, but they can not sprout above elevation of 1500 meters, 3, The Tillering seedlings shoot from March to September, the number of shoots each season may be correlated with the elevation and the bamboo species, the time of shoots each generation of the tillering seedlings may be correlated with the time of its last generation. 4. Each bamboo species gradually regain their biological characteristics within five to six years after flowering. 5. High growth and culm growth (between the nodes) are exponential function growth, the growth of basic diameter and rhizome diameter of young bamboos are straight line function growth. 6. Each bamboo growing curve are: Bashania fargesia; H=K/1 e~(4.115-0.3687t),Sinarundinaria nitida; H=k/1 e~3.633-0.3529t, Fargesis spathacea; H=K/ e~(3.9029-0.4188t).According tothe formulae it is may be forecast the regenerating number of years; Bashania fargesii is 20 years, Sinarundinaria nitida 19 years, Fargesia spathacea 17 years. In fact, the regeneration of the bamboo forest landscape may be recovered sometimes earlier.