短叶茳芏绿色与立枯地上生物量估测模型

Estimation models of green and dead standing aboveground biomass of Cyperus malaccensis

建立异速生长方程是非破坏性植物地上生物量(AGB)估测的常用方法。短叶茳芏(Cyperus malaccensis)是闽、粤等沿海省份河口湿地中常见的大型挺水植物,然而关于其AGB的异速生长方程还未见报道。本研究在年尺度逐月测定了闽江河口湿地短叶茳芏植物的株高、基径以及鲜重和干重。基于这些指标建立了不同精度和实用性的短叶茳芏单株绿色和立枯AGB(干重和鲜重)的异速生长方程。本文推荐的单株绿色植株干重和鲜重(g)AGB模型分别为y=exp(0.14x^(2)+0.32x-4.28)和y=exp(0.08x^(2)+0.58x-2.56),单株立枯干重(g)模型为y=exp(1.48x-6.76)(方程中x为株高(cm)的自然对数)。在单株绿色植株AGB模型的基础上,建立了单位面积绿色植株AGB的快速估测模型。本研究提出的建模方法对中国河口、滨海其他盐沼植物AGB的建模有一定的借鉴意义,所建模型可为我国滨海短叶茳芏湿地AGB估产及蓝碳碳汇估算提供技术支撑。

Constructing allometric equation is a common method for non-destructive estimation of plant above-ground biomass(AGB).Cyperus malaccensis is a common emergent macrophyte in the estuarine tidal wetlands of Fujian and Guangdong,the allometric equation of which has not been reported.In this study,we monthly measured plant height,base diameter,fresh and dry mass of C.malaccensis shoots in the Minjiang River estuary.Based on these indicators,the allometric equations of dry and fresh mass of both the green and dead standing AGBs of C.malaccensis individuals were established with different accuracy and practicability.The dry and fresh mass(g)models are y=exp(0.14x^(2)+0.32x-4.28)and y=exp(0.08x^(2)+0.58x-2.56),respectively,while the dry mass(g)model of dead standing plant is y=exp(1.48x-6.76)(x is the natural logarithm of plant height(cm)).Based on the AGB models of individual plant,we established the rapid green plant AGB estimation models per unit area.The modeling method proposed here is valuable for the AGB modeling of other salt marsh plants in estuaries and coastal areas.The models built in our study can provide technical support for the estimation of AGB and blue carbon sink of the coastal C.malaccensis marshes.