乌梁素海湿地芦苇最大羧化速率的高光谱遥感
发布时间:2018-05-30 12:32
本文选题:最大羧化速率 + 高光谱遥感 ; 参考:《生态学报》2017年03期
【摘要】:湿地植被生产力和固碳潜力的研究是全球碳循环和全球变化的热点研究问题。湿地植被的光合能力能够指示其生长的健康状态。最大羧化速率是重要的植被光合参数之一,对精确模拟湿地植被光合作用和气体交换模型中的固碳过程具有重要的作用。以内蒙古乌梁素海湖泊湿地为研究区,进行了芦苇叶片光合参数和光谱的测量。芦苇叶片最大羧化速率(V_(cmax))数值是基于Farquhar光合作用模型,从光合测量获取的A-C_i曲线计算并校正到25℃得到的。分别基于bootstrap PLSR模型、单波段和高光谱植被指数(包括简单比值指数SR和归一化差值指数ND),构建湿地芦苇叶片最大羧化速率(V_(cmax))估算模型。基于高光谱遥感图像HJ-1A HSI,采用ND高光谱指数中具有较高V_(cmax)估算精度的入选波段702和756 nm,获取研究区湿地芦苇最大羧化速率空间分布图。研究结果表明,湿地植被光谱特征和高光谱植被指数,可用于估算湿地芦苇V_(cmax),其中最高精度产生于基于bootstrap PLSR模型的建模方法(R~2=0.87,RMSECV=3.90,RPD=2.72),ND高光谱指数的V_(cmax)估算精度高于SR高光谱指数的估算精度;从获取的V_(cmax)空间分布图上提取估算值,其与测量值对比,存在较好的相关性(R~2=0.80,RMSE=4.74)。
[Abstract]:The study of wetland vegetation productivity and carbon sequestration potential is a hot issue in the global carbon cycle and global change. The photosynthetic capacity of wetland vegetation can indicate the healthy state of its growth. The maximum carboxylation rate is one of the important photosynthetic parameters of vegetation and plays an important role in accurately simulating the carbon sequestration process in wetland vegetation photosynthesis and gas exchange models. The photosynthetic parameters and spectra of Reed leaves in Wuliangsuhai Lake Wetland of Inner Mongolia were measured. The maximum carboxylation rate of Reed leaves was calculated and corrected to 25 鈩,
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