木质素是第二天然聚合物，木质素的降解是碳素循环中的关键一步。
Lignin is the second natural polymer. The biodegradation of lignin is the key step of carbon recycling.
产甲烷菌是重要的环境微生物，在自然界的碳素循环中起着重要的作用。
Methanogens is an important environment microorganism, which plays an important role in the global carbon cycle.
概述了草地生态系统碳素循环的一般特征，介绍了一个草地碳循环的分室模型；
Some major characteristics of the carbon cycle in grassland ecosystems were summarized, and a carbon cycle compartment model was introduced as well;
它是植物从水生进化到陆生的物质基础，是维持地球碳素循环的重要因素，在植物生长以及对生物与非生物的防御能力方面有着非常重要的作用。
The importance of lignin ranges from its fundamental roles in the evolution of land plants, global carbon cycling, and development, to its role in the biotic and abiotic stress resistance of plants.
它是植物从水生进化到陆生的物质基础，是维持地球碳素循环的重要因素，在植物生长以及对生物与非生物的防御能力方面有着非常重要的作用。
The importance of lignin ranges from its fundamental roles in the evolution of land plants, global carbon cycling, and development, to its role in the biotic and abiotic stress resistance of plants.
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