Spatial dynamics of soil moisture and temperature in a black spruce boreal chronosequence
Spatial dynamics of soil moisture and temperature in a black spruce boreal chronosequence
复制标题
DOI：
10.1139/x06-160
复制
发表时间：
2006-11-01
影响因子：
2.2
通讯作者：
Gower, Stith T.
中科院分区：
文献类型：
--
作者：
Bond-Lamberty, Ben;Brown, Karen M.;Gower, Stith T.
以北方黑云杉（Picea mariana（Mill.）BSP）站立。土壤温度（T-SOIL）的空间变异性进行了评估，在生长季节使用四个样带在每个立场，采用循环抽样设计，测量间隔2-92米。测量一次土壤湿度（θ（g））。使用球形模型分析地统计相关结构; 7年生和21年生林分的theta（g）和T-SOIL没有表现出稳定的范围或门槛。与稳定的范围和门槛模拟的空间格局在老看台上相当不错，虽然无法解释的变异性很高。计算的范围从3到150米，这些立场，长度可能与结构特征影响当地规模的能量转移。横断面间变异性显著，T-SOIL的变异性通常为平均值的5%-15%，theta（g）的变异性通常为平均值的10%-70%。对于大多数林分和深度，T-SOIL和θ（g）呈负相关，θ（g）每上升1%，T-SOIL就会下降0.5-0.9摄氏度。这里报告的结果提供了初步数据，以评估的空间变异性的T-SOIL和θ（g）在各种北方森林的林分年龄。
This study analyzed the spatial dependencies of soil moisture and temperature in a six-stand chronosequence of boreal black spruce (Picea mariana (Mill.) BSP) stands. Spatial variability of soil temperature (T-SOIL) was evaluated twice during the growing season using four transects in each stand, employing a cyclic sampling design with measurements spaced 2-92 m apart. Soil moisture (theta(g)) was measured on one occasion. A spherical model was used to analyze the geostatistical correlation structure; theta(g) and T-SOIL at the 7- and 21-year-old stands did not exhibit stable ranges or sills. The fits with stable ranges and sills modeled the spatial patterns in the older stands reasonably well, although unexplained variability was high. Calculated ranges varied from 3 to 150 m for these stands, lengths probably related to structural characteristics influential in local-scale energy transfer. Transect-to-transect variability was significant and typically 5%-15% of the mean for T-SOIL and 10%-70% for theta(g). T-SOIL and theta(g) were negatively correlated for most stands and depths, with T-SOIL dropping 0.5-0.9 degrees C for every 1% rise in theta(g). The results reported here provide initial data to assess the spatial variability of T-SOIL and theta(g) in a variety of boreal forest stand ages.