CAJ | 학술논문

　　陆地生态系统土壤有机质(SOM)的碳动态研究已引起科学界的广泛关注，对海陆交错带的相关研究则较少。本研究选取位于广东深圳湾的三个红树林群落土壤剖面，测定了土壤有机碳(SOC)含量和SOM的稳定碳同位素比率(13C)等含量。结果表明，地表100 cm土壤碳库分别为：桐花树(Aegiceras corniculatum)群落碳库量较大，达673.2 Mg/ha，而木榄(Bruguiera gymnorrhiza)+秋茄(Kandelia obovata)群落为371.9 Mg/ha，白骨壤(Avicennia marina)群落为325.2 Mg/ha。这三个剖面SOM的13C介于-29.4译至-24.1译之间，指示其来源主要为C3植被。不同于传统的SOM的13C随深度增加而增加的趋势，桐花树和白骨壤剖面底层的SOM的13C随深度增加而呈现亏损，而木榄+秋茄SOM的13C在整个剖面则基本稳定。红树林SOM的13C的垂直格局可能反映了大气CO2的13C的历史变化、有机质分解过程中的同位素分馏作用、植物根系分泌物和凋落物13C的差异，和土壤对植物组织的选择性保存等因素的综合作用。此外，诸如潮汐作用、群落演替阶段以及生物干扰等，也会对红树林土壤的碳动态产生一定的影响。结果还表明，在红树林有机质沉积过程中，土壤含水量通过作用于土壤分解过程在某种程度上控制SOC含量，同时间接作用于土壤同位素分馏过程而影响SOM的13C。
　　륙지생태계통토양유궤질(SOM)적탄동태연구이인기과학계적엄범관주，대해륙교착대적상관연구칙교소。본연구선취위우엄동심수만적삼개홍수림군락토양부면，측정료토양유궤탄(SOC)함량화SOM적은정탄동위소비솔(13C)등함량。결과표명，지표100 cm토양탄고분별위：동화수(Aegiceras corniculatum)군락탄고량교대，체673.2 Mg/ha，이목람(Bruguiera gymnorrhiza)+추가(Kandelia obovata)군락위371.9 Mg/ha，백골양(Avicennia marina)군락위325.2 Mg/ha。저삼개부면SOM적13C개우-29.4역지-24.1역지간，지시기래원주요위C3식피。불동우전통적SOM적13C수심도증가이증가적추세，동화수화백골양부면저층적SOM적13C수심도증가이정현우손，이목람+추가SOM적13C재정개부면칙기본은정。홍수림SOM적13C적수직격국가능반영료대기CO2적13C적역사변화、유궤질분해과정중적동위소분류작용、식물근계분비물화조락물13C적차이，화토양대식물조직적선택성보존등인소적종합작용。차외，제여조석작용、군락연체계단이급생물간우등，야회대홍수림토양적탄동태산생일정적영향。결과환표명，재홍수림유궤질침적과정중，토양함수량통과작용우토양분해과정재모충정도상공제SOC함량，동시간접작용우토양동위소분류과정이영향SOM적13C。
Mangrove ecosystems are highly productive and play an important role in tropical and global coastal carbon (C) budgets. However, soil organic carbon (SOC) storage and turnover in mangrove forests are still poorly understood. Based on C isotopic measurements of soil cores of three mangrove stands in Shenzhen bay, Southern China. SOC density was 673.2 Mg/ha in Aegiceras corniculatumstand stand, 371.9 673.2 Mg/ha in Bruguiera gymnorrhiza + Kandelia candel-dominated stand) and 325.2 Mg/ha in Avicennia marina stand. SOC 13C values at the three mangrove sites ranged from-29.4 to-24.1‰, which mean that the carbon came from C3 plant. The vertical variation of SOC 13C indicated the comprehensive results of depletion of 13C of atmospheric CO2 by fossil fuel emissions, the difference between root and leaf 13C, preferential microbial decomposition, and tidal process.