譚雨亭 邢文鋒 謝延平 李先艷 桑子陽 高晗


摘要:以10 a生日本落葉松人工林為材料,分別進行15%,25%,40%不同間伐強度試驗,撫育間伐6年后,調查林木胸徑與樹高,分析表明強度撫育間伐對胸徑影響與不撫育、弱間伐強度相比差異極顯著;中度間伐與不撫育差異顯著。不同撫育間伐強度對高生長量、單位面積林分蓄積影響差異不顯著。
關鍵詞:日本落葉松;撫育間伐強度;中齡林; 五峰縣
中圖分類號:S753.7+5;S791.223文獻標識碼:A文章編號:1004-3020(2015)03-0011-03
Effect of Different Tending and Thinning Intensity on Growth
of MiddleAge Larix kaempferi Plantation
Tan Yuting(1)Xing Wenfeng(1)Xie Yanping(2) Li Xianyan(2) Sang Ziyang(2) Gao Han(3)
(1.National Beifengya Forest Farm in Wufeng CountyYichang443400; 2.Wufeng Tujia Autonomous County
Forestry BureauYichang443400.3. Yichang City Forestry and Science Institute Yichang443111)
Abstract: We adopted three different (including 15 percent, 25 percent and 40 percent) thinning intensity experiments on the 10yearold Larix kaempferi plantation. After six years of tending and thinning, DBH and tree height were investigated.The experimental results indicated that the heavy cuttings effect on DBH were extremely significantly different with no cutting or light intermediate cuttings, and there were significantly different with moderate cuttings and no cuttings. Different intensity of intermediate cuttings has no significant difference on high growth and stand volume per unit area.
Key words:Larix kaempferi;tending and thinning intensity;middleage forest;Wufeng County
日本落葉松Larix kaempferi是北亞熱帶地區重要的引種栽培樹種,是優良的短周期造紙原料,北亞熱帶亞高山是我國日本落葉松最適宜引種區,湖北省五峰縣1995年以后大面積栽培,目前全縣日本落葉松人工林已達8萬hm2。該區日本落葉松引種時間較短,在引種試驗,整地、撫育、施肥方式對幼齡林的影響等方面開展了研究工作,但對中齡林科學合理的撫育間伐是當前日本落葉松培育中急需解決的問題。為此,我們開展了不同撫育間伐強度對以10 a生日本落葉松人工林林分生長量影響的試驗研究,借此指導五峰縣及相似地區中齡林日本落葉松的撫育間伐工作。
1試驗地概況
試驗地點位于湖北省五峰縣北風埡林場北風埡工區,試驗地面積4 hm2, 坡向西南,坡度18°。試驗地地處武陵山區,屬亞熱帶季風氣候,年平均氣溫10.7 ℃,極端最高溫34.5 ℃,極端最低溫-17 ℃。≥0 ℃活動積溫4 755.5 ℃,≥10 ℃活動積溫3 927.6 ℃,無霜期140 d左右,年平均日照時數1 342.6 ?h,年平均降水量1 754.6 mm,相對濕度79%。
2材料與方法
2.1試驗材料
試驗林分為日本落葉松莊河種源人工純林,1995年春季造林,初植密度1 650~2 500株/hm2,2006年3月間伐時林齡11 a。……