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为探讨农田防护林合理经营的最佳途径，本文从林带木材生物学特性研究入手，针对杨树农田防护林带不同品种、不同立地、不同行位和不同年龄木纤维长度的变化规律进行了研究，结果表明，杨树林带木纤维长度的变化主要受品种和年龄的影响，与林带特殊生境无显著相关；通过林带纤维长度频率分布和木纤维长度与年龄相关关系的分析，建立了一系列相关模型，据此得出了林带木纤维长度相对稳定的年龄；该年龄即为农田防护林带开始进入全面有效防护农田状态时的年龄，此时林带所达到的树高可作为农田防护林规划设计的成林高。由此为农田防护林带的经营提供了可靠的木材生物学依据。
In order to explore the best way to manage farmland shelterbelt properly, the paper studied the wood biological characteristics of shelterbelts, and studied the variation rules of wood fiber length in different shelterbelts, different locations and ages in poplar farmland shelterbelts. The results showed that the change of wood fiber length was mainly influenced by variety and age and had no significant correlation with the special habitat of forest belt. Based on the analysis of frequency distribution of wood fiber length and wood fiber length and age, a series of related models were established, Based on this, we can draw the conclusion that the length of wood fiber in forest belt is relatively stable, and the age is the age when farmland shelterbelts start to enter the state of full and effective protection of farmland. At this time, . This provides a reliable timber biological basis for the management of farmland shelterbelts.