IBIS Model-Based Simulation Study on Variation of Ecological Carbon Sink Potential in Shenzhen City

Abstract

IBIS (Integrated Biosphere Simulator) model is an ecosystem process model, which represents the research direction of a global carbon cycle simulation. Based on the existing research achievements, the regional ecological carbon sink potential is simulated from point to surface with a long time serie of meteorological data (1954-2010), data on different ecosystem vegetation types, soil texture data, terrain data and remote sensing data. The results are listed as follows: there is no significant variation of potential carbon sink of Shenzhen vegetation over the past 30 years, carbon sequestration caapcity ranges within 43.52-55.82×104Mg C/a, and the potential carbon sink intensity value within 0-624 C/m2/a. Precipitation is a main factor which influnces the ecosystem carbon sink intensity in Shenzhen City. The carbon sink intensity of ecosystem is increased with more annual precipitation.

Simulation of soil respiration in forests at the catchment scale in the eastern part of northeast China

“…3During the growing season, the five forest types showed a similar seasonal pattern in simulated soil respiration, characterized by a mono鄄peak curve, with a summer maximum and an early and late growing season minimum. 土壤呼吸是指土壤向大气释放 CO 2 的过程 [1] ,主要由植物根系呼吸和土壤微生物呼吸产生,极少部分来 自于土壤动物呼吸和化学氧化,是陆地碳循环的关键生态学过程 [2] 。 由于土壤拥有巨大的碳贮量,土壤呼吸 在全球碳收支中扮演着重要角色,其变化对全球碳平衡具有重大的影响 [3] 。 因此,准确估算不同陆地生态系 统土壤呼吸,了解土壤呼吸的时空格局,对全球碳平衡的预算、阐明全球碳循环的变化规律和全球气候变化潜 在效应的评估具有重大意义 [4] 。 利用模型估算土壤呼吸已成为碳循环研究的重要方法。 统计模型是土壤呼吸模拟常用的模型之一,这类 12] ,体现了全球碳循环过程的复 杂性,代表着全球碳循环模型的研究方向 [13] ,受到众多学者的普遍关注。 在国外,IBIS 模型广泛应用于北美 洲、欧洲和非洲地区的土壤呼吸及碳循环研究,涉及森林、草地和农田等生态系统 [14鄄 19] 。 近年来,在我国的应 25] ,主要集中在东北地区,如王萍 [20] 利用 IBIS 模拟了大小兴安岭森林生态系统土壤呼吸,刘 曦等 [21] 运用 IBIS 模拟了黑龙江和吉林两省部分地区的森林土壤呼吸,均取得较好的模拟效果。 [11] 。 该模型实现一个集成框架内地表 水热过程、陆地生物地球化学循环和植被动态的模拟,主要包含 5 个模块( 图 1) [12] :地表模块( 土壤、植被与…”