冰雪灾后粤北山区受损杉木萌条生长规律研究

Characteristics of Sprout Growth of the Damaged Cunninghamia lanceolata in Mountainous Area of Northern Guangdong After Ice-snow Disaster

以位于粤北山区天井山林场的杉木（Cunninghamia lanceolata）人工林中的受损杉木为研究对象，研究了2008年初冰雪灾害后1年内受损杉木的恢复和更新情况。采用标准地调查法，选取4种不同类型受损杉木的标准木（类型I：断干高在原树高的1／3内；类型Ⅱ：断干高在原树高的113～2／3处；类型Ⅲ：断干高在原树高的2／3以上；类型Ⅳ：倒伏），监测其自2008年11月-2009年11月期间的萌条高和基径的月生长动态。结果表明：冰雪灾害后的一年内，受损杉木萌条高生长的旺盛期为5-9月份，而基径生长总体呈现初期生长增加明显，后期增速逐渐缓慢的特点。林分密度与受损杉木萌条的生长关系密切，需在灾后杉木人工林重建时给予重点关注。受损Ⅲ型和受损Ⅳ型杉木萌条生长较好，但综合考虑生长和成材效果，建议保留受损Ⅲ型，伐掉受损杉木I型、Ⅱ型和Ⅳ型。

The recovery and update status of the damaged Cunninghamia laneeolata in mountainous area of northern Guangdong within a year after ice-snow disaster in January 2008 was studied to provide support for post-disaster reconstruction of C. laneeolata plantations. By the method of sample plot, sample trees with 4 kinds of damaged types （ type Ⅰ： borken stem height （BSH） /tree height （TH） 〈1/3; type Ⅱ： 1/3 〈 BSH/TH〈 2/3; typeⅢ： BSH/TH 〉 2/3; type IV ：lodging ） of C. laneeolata trees from C. laneeolata plantations in Tianjingshan forest farm in mountainous area of northern Gnangdong were selected to measure the sprout height （SH） and ground diameter （GP）dynamic of their sprout within a year from November 2008 to November 2009. Results showed that the higher growth rate of SHappeared from May 2009 to September 2009, while GD represented a trend in growth rate： increasing first and then slowing down. Stand density was found to have a close relationship with the growth of C. laneeolata sprout, hence it should be considered and focused in post-disaster reconstruction. Also, in the restoration and reconstruction of Chinese fir plantation, we proposed to keep type III and cut down type I , Ⅱ and IV. Overall, C. laneeolzta sprout from type IU and IVhad better growth, while after comprehensively analysis from growth and wood formation, C. laneeolata sprout from type llI was suggested to reserve, whereas those sprouts from I ,Ⅱand IV.