剪枝后废弃物堆肥的物理化学性质及其季节变化

Chemical and Physical Properties of Pruning Waste Compost and Their Seasonal Variability

通过对12个不同剪枝后废弃物堆肥(PWC)样品理化性质分析,评价它们是否适合作为观赏植物的生长基。样品定期地采集于相同的堆肥处,堆肥时间大于18个月,考察季节变化对堆肥的影响。除了剪枝后废弃物堆肥外,加拿大泥炭藓和商业生长基(CGM)被用作参考材料。PWC堆肥的性质如下:pH值在8以上,显著高于泥炭和商业生长基的pH值;所有堆肥样品都显示出丰富的有机质和相当高的阳离子交换量。C/N比值在22～48之间,显著高于15～20最优范围。虽然对堆肥进行抽样时处于不同季节,但其化学性质并无显著差异,仅持水量随季节有微小变化。与加拿大泥炭和商业生长基相比,修剪下来的植物残枝可以作为盆栽观赏植物生长基的组成部分。

Selected chemical and physical properties of 12 different pruning waste compost（PWC） samples were evaluated to assess their suit-ability as substrates for ornamental plants. Samples were taken periodically from the same composting facility over 18 months in order to determine if there was any seasonal variability. In addition to the PWC samples, a Canadian Sphagnum peat and a commercial growing medium（CGM） were used as standard materials. With respect to PWC properties, pH values were above 8, significantly higher than the pH value of peat and the commercial substrate. All samples showed adequate levels of organic matter and correspondingly high cation exchange capacity（CEC） values. The C/N ratio varied between 22 and 48, significantly higher than the optimal values of 15- 20. Although composts were sampled from piles established in different seasons, no significant differences were found in their chemical properties. However, water retention characteristics were affected by seasonal changes in components entering the facility. Comparing the properties of PWC to those of peat and eommereial growing medium, this material appears to be an acceptable component ofa substrate for container-grown ornamental plants.