楊農復合經營系統碳儲量及其分布特征研究

江　浩，季永華，王　磊，張亞楠(江蘇省林業科學研究院，江蘇　南京　211153)

楊農復合經營系統碳儲量及其分布特征研究

江浩，季永華*，王磊，張亞楠(江蘇省林業科學研究院，江蘇南京211153)

摘要:以楊樹純林和楊農復合林2種生態系統為研究對象，對林木、農作物(林下植被)、土壤、凋落物各組分的碳儲量進行比較研究。結果表明，楊樹純林和楊農復合林的碳儲量分別為(101.59±8.1)，(116.65±10.3) t/hm2。在2個生態系統中林木及土壤碳儲量均占總量的90%以上。楊農復合林凋落物和林下植被碳儲量所占比例約為6%，是楊樹純林的2倍。林木碳儲量、農作物(林下植被)碳儲量均為楊農復合林較高;楊農復合林土壤碳儲量僅在中間層(10～25，25～50 cm)顯著高于楊樹純林;凋落物碳儲量2者之間差異不顯著。相對純林，農林復合系統具有較高的吸收和固碳能力。

關鍵詞:楊樹;楊農復合生態系統;土壤;碳儲量;分布特征

Carbon storage and distribution in poplar and poplar-crop intercropping forests

JIANG Hao，JI Yong-hua*，WANG Lei，ZHANG Ya-nan

(Jiangsu Academy of Forestry，Nanjing，211153，China)

Abstract:Carbon storage and distribution in poplar and poplar-crop intercropping forests were studied in Dafeng Farm，north of Jiangsu Province.We concluded that the carbon storages of poplar and poplar-crop agro-forestry ecosystem were (101.59±8.1) and(116.65±10.3) t/hm2respectively.And the soil and wood carbon storage were more than 90% of the total in both ecosystems.The carbon storage of undergrowth vegetations and litter-fall was about 6% in poplar-crop agroforestry ecosystem，twice of that in poplar forest.There was significant difference in soil carbon storage between poplar and poplar-crop agro-forestry ecosystem within the soil layers 10～25 and 50～100 cm.Carbon storages in the harvested parts (woods and undergrowth vegetations) of poplar forest were significantly lower than that in poplar-crop agro-forestry ecosystem.The carbon return in litter-fall showed no differences between two ecosystems.The results showed the agro-forestry ecosystem had relatively a high potential in carbon absorption and sequestration.

Key words:Poplar;Agro-forestry ecosystem;Soil;Carbon storage;Distribution

陸地植被具有強大的固碳功能，是目前應對全球氣候變化最經濟、最有效的途徑。森林生態系統植被碳儲量約占全球植被碳庫的86%以上，林下土壤碳儲量占全球碳庫的73%左右［1］。

林農復合生態系統是通過空間布局或時間安排，將多年生木本植物精心地用于農作物和(或)家畜所用的土地類型經營單元內，使其形成各組分間在生態上和經濟上具有相互作用的土地利用系統和技術系統的集合［2］。林農復合經營可使土地及其空間的光、熱、水得到更加充分的利用。近年來，關于農林復合經營系統在固碳以及減緩溫室效應中的作用已經越來越多地引起人們的重視［3－6］。……