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栓皮栎水源林林木耗水尺度扩展方法研究被引量:37
2004年
Single trees sapwood scattering style and diameter classes diurnal water consumption rhythm were studied in a 48 years old Quercus variabilis stand at the east hill slope, located in the Forest Research Station of Beijing Forestry University in the water conservation area in Beijing (39°54′N, 116°28′E). Results showed that relation between trees sapwood area and diameter at breast height (DBH) was significant. Single trees daily water consumption ascended as DBH and sapwood area increased, and related significantly. Daily water consumption of different diameter class in September ascended steeply from the early morning and got the peak around 11:00 pm, and then descended till 18:00 when it got the valley slowly. Three-dimension model of daily-accumulated water consumption was acquired by scaling-up method from the typical Richards model and characteristic parameters of daily stand water consumption course were calculated from modulated Richards equation derivative: W d-it-j=(-7.147+1.174 d-i)[1-(-3 025.937+d 2.175 i)e (-0.011t-j)] 1/(1-d 0.242 i)(R=0.985 8).
王华田邢黎峰马履一孙鹏森
关键词:栓皮栎水源保护林
侧柏树干边材液流的空间变化规律及其相关因子被引量:48
2006年
利用树干边材液流探针(TDP)和微型自动气象站对北京西山地区侧柏人工林树干秋季不同高度、不同方位、不同径阶边材液流及相关环境因子日周期变化动态进行连续观测,对环境因子与边材液流速率的相关性进行分析。结果表明:同一立木,树干上位边材液流启动早,上升快,到达峰值后随即急剧下降;树干下位边材液流启动时间明显推迟,且上升和下降缓慢;二者之间最大液流速率相差2倍以上。树干不同方位边材液流速率日变化进程有差异,其中南侧树干边材液流速率很低,北侧、西侧和东侧3个方位液流速率较高,边材液流速率与测定部位的边材宽度和冠幅关系不明确。单株树干边材液流速率与树干冠幅、树干直径和边材面积相关不显著,但液流通量随直径的增大而增大,不同径阶单木液流通量波动规律不尽相同。侧柏林分内部环境因子日周期变化规律明显,边材液流速率与主要环境因子相关显著,其中边材液流速率与空气湿度呈负相关,各径阶表现出相同的趋势;边材液流速率与太阳辐射强度和空气温度之间存在极显著的相关性,胸径大的立木呈正相关,胸径小的单株呈负相关;风速对边材液流速率有较大影响;20~40cm土壤层温度对树木耗水有显著的影响,大径阶立木表现为负相关,小径阶立木表现为正相关。以太阳辐射强度、气温、空气湿度、风速、不同层次土温等环境因子作自变量,以边材液流速率作因变量,经过逐步回归,建立侧柏边材液流速率与环境因子的多元线性模型,回归方程极显著。
王华田赵文飞马履一
关键词:侧柏环境因子
不同季节麻栎树干贮水量的动态变化被引量:8
2007年
Using thermal dissipation probe(SF-G), a sample tree’s diurnal sap flow velocity and sap flow density at different trunk heights were monitored in the Quercus acutissima plantation in the Forestry Centre of Taishan Academy of Forestry Science in spring and autumn. 5 days data both in spring and autumn were selected, and spatial variation of trunk water pondage and sap flow was analyzed. In spring, the peak value was higher and fluctuated acutely, and the peak time appeared early and lasted longer than that in autumn. Sap flow velocity at upper trunk section was higher than that at mid and lower trunk section. In autumn, however, sap flow flux at the three trunk sections was very small and similar. Sap flow movement was lagged in order from the lower trunk to upper trunk by 60~120 min in autumn. Spring trunk poundage fluctuated sharply and extended greatly than that in autumn. The relative trunk water restoring time in spring was about 20 h, and 10~12 h longer than that in autumn.
赵文飞王迎王华田亓立云董玉峰
关键词:麻栎
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