摘要
以惠济区林龄10a的杨树人工林为研究对象,距树干1、1.5、2m处设置样点,研究0~10cm和10~20cm层根系结构及碳分布特征,旨在为培育大径级木材的经营与管理提供理论依据。结果表明:1)根径在距树干不同调查距离、不同土层深度主要以细根形式出现,根径范围在0.3~0.7mm之间。处理1(适度抚育)、处理2(强度抚育)、对照3个处理水平下,0~10、10~20cm层的根长密度均在调查距离2m处出现最小值,为3.106、2.181、2.091、2.418、2.662、0.946mm·cm^(-3)。2)不同抚育处理杨树人工林不同调查距离区地表层根系碳储量大于下层,不同调查距离根系总碳储量0~10cm层变化规律:处理2>处理1>对照;10~20cm层变化规律:处理1>处理2>对照。0~10cm土层处理2水平杨树人工林根系碳储量最高,为30 990.94t·hm^(-2),分别比处理1、对照林分高10.39%和14.04%;10~20cm土层处理1水平杨树人工林根系碳储量最高31 253.66t·hm^(-2),分别比处理2、对照林分高10.18%和15.75%;2土层均表现出抚育后杨树人工林根系碳储量大于未抚育的。3)对照、处理1、处理2水平下灌草的碳储量都是最低的,其值分别为0.027、045、0.126t·hm^(-2),且处理2>处理1>对照;对照、处理1、处理2水平下分解层碳储量之和是最高的,半分解碳储量为0.593、0.532、0.436t·hm^(-2),分解碳储量分别是0.697、0.445、0.502t·hm^(-2),分解层的碳储量有下降的趋势;3个处理水平林下总碳储量分别为1.850、1.551,2.271t·hm^(-2),且处理2>对照>处理1。
Taking the poplar plantations in Huiji district,Zhengzhou of Henan Province as the research ob j ect,sampling points were set up from the trunk with distances of 1,1.5, and 2 re,respectively,to study the structure and carbon distribution characteristics of the roots within two soil layers- 0-10 and 10-20 cm after different thinning treatments,and to provide theoretical basis for the management and administration of large diameter grade timber. The results showed that..1）the average root diameter in different distances and soil depths was in the range of 0.3-0.7 mm,mainly in the form of fine roots. The minimum values of length density appeared in the distance of 2 m from the trunk, these minimum values in three levels of thinning （treatment 1, moderately thinning, T1; treatment 2, intensively thinning, T2; treatment 3, the control,without thinning,T3） were 3. 106,2. 091,and 2. 662 mm · cm-3 in the soil layer of 0-10 cm,and they were 2. 181,2. 418,and 0. 946 mm · cm -3 in 10-20 em soil layer. 2）Root carbon storage in the surfacelayer of different thinning treatments in different poplar plantations was greater than the under layer. The variation of total carbon storage in 0-10 cm layer in root system of different survey distances was in the order of T2〉T1〉T3,and in 10-20 cm layer,the orer was T1〉T2〉T3. The root carbon storage of T2 was the highest in 0-10 cm soil layer with the value of 30 990.94 t · hm-2 ,10.39% and 14.04%higher than T1 and T3,respectively. The root carbon storage of T 1 was the highest in 10-20 cm soil layer with the value of 31 253.66 t ·hm -2,10.18% and 15.75% higher than T2 and T3,respectively. The root carbon storages of thinned plantations were higher than those without thinning in two soil layers. 3） The lowest values of carbon storage appeared in bush and grass layer in all the three treatments, with the values of 0. 045 （T1） ,and 0. 126 （T2） ,and 0. 027 t · hm-2 （T3） ,respectively. The sum of the carbon storage of the decomposition layer were the highest, and the values of the half decomposed carbon storage were 0. 532 （T1）, 0.436 （T2）,0. 593 （T3） t ·hm-2 ,respectively,and the values of decomposed carbon storage were 0. 445（T1）, 0.502 （T2）,0. 697 （T3） t· hm-2, respectively. The carbon storage of the decomposition layer had a decreasing tendency. The values of the total carbon storage were 1. 551 （T1） ,2. 271 （T2） ,and 1.850 t · hm-2 （T1）.
作者
闫东锋
郭丹丹
吴桂藏
杨喜田
YAN Dong-feng GUO Dan-dan WU Gui-zang YANG Xi-tian(Forestry College, Henan Agricultural University, Zhengzhou, Henan 45000g, Chin)
出处
《西北林学院学报》
CSCD
北大核心
2017年第2期30-36,共7页
Journal of Northwest Forestry University
基金
国家自然科学基金项目(31170580)
河南省科技攻关项目(142102110081)
河南省林业厅技术招标项目"河南省山区森林抚育技术研究"
河南省高等学校青年骨干教师资助计划(2014GGJS-036)
关键词
杨树人工林
抚育处理
根系
分布特征
Populus plantation
tending treatment
fine root
distribution
