several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measuremen的主要需求,所以生态环境建设是林业建设的首要任务。
二 林业生态系统的内涵、特点
1 内涵
林业生态的工程是随着林业发展战略而转移,所以国家的生态环境工程建设需要通过继承、交叉等形成的一门全新的工程。它是由生态学、生态经济学、系统科学以及生态工程原理,来针对自然资源的环境特征和社会经济的发展现状,而且将相适应的植物、动物及微生物等生物种群通过人工匹配来结合,从而形成一种高效而又稳定的人工复合型的生态系统。
2 特点
林业生态工程的核心就是在对于生态理论的充分理解作为基础之上,再根据生态系统理论,将生态环境改善作为目标,通过工程的措施再进行系统的设计、规划和调控人工生态系统,结构的要素、工艺的流程、信息的反馈关系及控制机构所进行的林业生态建设。此工程贵在坚持土地资源优化组合的原则,通过大力的植树造林,全方面保护和经营现有的森林,合理的调整森林分布格局与功能结构,充分发挥森林改善生态环境以及抵御自然灾害的生态功能。
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal
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