Zhao Ping, Mei Ting-Ting, Ni Guang-Yan, Yu Meng-Hao, Zeng Xiao-Ping
South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
Ying Yong Sheng Tai Xue Bao. 2012 Apr;23(4):979-84.
Based on the validation of Granier's empirical formula for calculating tree stem sap flux density, a comparative study was conducted on the measurement of Bambusa chungi sap flow by using different lengths of thermal dissipation probe (TDP), aimed to approach the applicability of TDP in measuring the sap flow of B. chungii. The difference in the daily change of the sap flow between B. chungii and nearby growing Schima superb was also analyzed. Because of the thinner bamboo wall and the heterogeneous anatomy, the sap flux density of B. chungii measured by 10 mm long probe could be underestimated, but that measured by 8 and 5 mm long probes could be relatively accurate. The comparison of the sap flow between B. chungii and nearby growing S. superba revealed that both the mean sap flux density and its daily change pattern' s skewness of B. chungii were higher than those of S. superba, but the nighttime sap flow of B. chungii was less than that of S. superba, indicating that the water recharge of B. chungii during nighttime was less active than that of S. superba. It was suggested that using TDP to investigate the sap flow of bamboo would be feasible, but careful calibration would be required before the TDP was put into application on different bamboo species.
基于对Granier计算树干液流通量密度经验公式的验证，采用不同长度的热消散探针（TDP）对粉单竹液流进行测量比较研究，旨在探讨TDP在粉单竹液流测量中的适用性。同时分析了粉单竹与附近生长的木荷之间液流日变化的差异。由于竹壁较薄且解剖结构不均匀，10mm长探针测量的粉单竹液流通量密度可能被低估，而8mm和5mm长探针测量的结果相对准确。粉单竹与附近生长的木荷液流比较表明，粉单竹的平均液流通量密度及其日变化模式的偏度均高于木荷，但粉单竹夜间液流小于木荷，说明粉单竹夜间水分补给不如木荷活跃。研究表明，利用TDP研究竹子液流是可行的，但在将TDP应用于不同竹种之前需要仔细校准。
