Paembonan S A, Hagihara A, Hozumi K
Department of Forestry, Faculty of Agriculture, Hasanuddin University, Ujung Pandang, Indonesia.
Tree Physiol. 1992 Jan;10(1):101-10. doi: 10.1093/treephys/10.1.101.
Over a three-year period, CO(2) exchange rates were measured continuously on the aboveground parts of a 13-year-old hinoki (Chamaecyparis obtusa (Sieb. et Zucc.) Endl.) tree in the field, using an open gas-exchange system tracking ambient temperature. The relationship between daily aerial respiratory consumption and daily gross production, which was analyzed monthly, closely resembled McCree's equation. The value of the coefficient of growth respiration ranged between 0.0 in winter and 0.16 in summer and increased with increasing monthly mean temperature. A clockwise loop was observed for monthly change in the relationship between the coefficient of growth respiration and temperature. Maintenance respiration could be formulated as a power function of aboveground dry weight. The exponent of the equation ranged from 0.3 to 1.1. A value of 1.1 in May and June, when trees were growing most actively, indicated that maintenance respiration was directly proportional to aboveground weight. In March, April, July, and August, maintenance respiration was not proportional to aboveground weight, but it was closely proportional to surface area. The exponent value exhibited seasonal change with a clockwise loop in response to monthly average temperature. During the dormant season, respiration was used only for maintenance purposes, whereas during the growing season both growth and maintenance respiration occurred. Annual growth and maintenance respiration increased with increasing tree age. The average annual contribution to total respiratory consumption was 21% for growth respiration and 79% for maintenance respiration.
在三年时间里，使用一个跟踪环境温度的开放式气体交换系统，对田间一棵13年生日本扁柏（Chamaecyparis obtusa (Sieb. et Zucc.) Endl.）地上部分的二氧化碳交换率进行了连续测量。每月分析的日空中呼吸消耗与日总生产量之间的关系与麦克里方程非常相似。生长呼吸系数的值在冬季为0.0，夏季为0.16，且随月平均温度升高而增加。生长呼吸系数与温度之间的关系呈现出顺时针月度变化环。维持呼吸可以表示为地上干重的幂函数。该方程的指数范围为0.3至1.1。在树木生长最活跃的五月和六月，指数值为1.1，表明维持呼吸与地上重量成正比。在三月、四月、七月和八月，维持呼吸与地上重量不成正比，但与表面积密切相关。指数值随月平均温度呈现顺时针环状的季节性变化。在休眠季节，呼吸仅用于维持目的，而在生长季节，生长呼吸和维持呼吸都存在。年生长呼吸和维持呼吸随着树龄的增加而增加。生长呼吸对总呼吸消耗的年平均贡献为21%，维持呼吸为79%。
