Seasonal changes of leaf chlorophyll content as a proxy of photosynthetic capacity in winter wheat and paddy rice
Accurate representation of photosynthetic capacity and its seasonal variations is critical for modeling carbon sequestration of cropland ecosystems through photosynthesis. Previous studies indicated that the maximum carboxylation rate at 25 °C (Vcmax25) is the key determinant of photosynthetic capac...
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Elsevier
2022-07-01
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| Series: | Ecological Indicators |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1470160X22004897 |
| _version_ | 1818235305036087296 |
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| author | Jing Li Xuehe Lu Weimin Ju Ji Li Shihua Zhu Yanlian Zhou |
| author_facet | Jing Li Xuehe Lu Weimin Ju Ji Li Shihua Zhu Yanlian Zhou |
| author_sort | Jing Li |
| collection | DOAJ |
| description | Accurate representation of photosynthetic capacity and its seasonal variations is critical for modeling carbon sequestration of cropland ecosystems through photosynthesis. Previous studies indicated that the maximum carboxylation rate at 25 °C (Vcmax25) is the key determinant of photosynthetic capacity and can be mapped according to leaf nitrogen (N) and chlorophyll (Chl) contents. However, whether relationships of Vcmax25 with leaf nitrogen and chlorophyll contents in cropland ecosystems change over the whole growing season remain unclear. To address this question, we conducted intensive field campaigns in winter wheat and paddy rice farmlands of Eastern China, with leaf Vcmax25, the maximum electron transport rate at 25 °C (Jmax25), N, and Chl measured every 7 to 10 days from the tillering stage to maturity. Results showed that Vcmax25 and Jmax25 varied significantly during the growing seasons and maximized at flowering stages. For both winter wheat and paddy rice, Chla (Chl content at the area unit) showed significantly different relationships with Vcmax25 pre- and post- flowering while Na (N content at the area unit) did not. When different empirical models were used for pre- flowering and post- flowering stages, Vcmax25 estimated from Chla was closer to observations (R2 = 0.875, RMSE = 9.479 µmol m−2 s−1) than that estimated from Na (R2 = 0.565, RMSE = 17.718 µmol m−2 s−1). The findings in this study imply that the combination of remotely sensed leaf Chla content and phenology would improve the mapping of Vcmax25 for crops at regional and even global scales. |
| first_indexed | 2024-12-12T11:51:51Z |
| format | Article |
| id | doaj.art-1ab8fcb3455b435882872ecaabf8a3f7 |
| institution | Directory Open Access Journal |
| issn | 1470-160X |
| language | English |
| last_indexed | 2024-12-12T11:51:51Z |
| publishDate | 2022-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecological Indicators |
| spelling | doaj.art-1ab8fcb3455b435882872ecaabf8a3f72022-12-22T00:25:17ZengElsevierEcological Indicators1470-160X2022-07-01140109018Seasonal changes of leaf chlorophyll content as a proxy of photosynthetic capacity in winter wheat and paddy riceJing Li0Xuehe Lu1Weimin Ju2Ji Li3Shihua Zhu4Yanlian Zhou5International Institute for Earth System Sciences, Nanjing University, Nanjing 210023, China; School of Geography and Ocean Science, Nanjing University, Nanjing 210023, ChinaInternational Institute for Earth System Sciences, Nanjing University, Nanjing 210023, China; School of Geography Science and Geomatics Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu 215009, ChinaInternational Institute for Earth System Sciences, Nanjing University, Nanjing 210023, China; Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Jiangsu 210023, China; Jiangsu Center for Collaborative Innovation in Geographic Information Resource Development and Application, Nanjing, Jiangsu 210023, China; Corresponding author at: International Institute for Earth System Sciences, Nanjing University, Nanjing 210023, China.International Institute for Earth System Sciences, Nanjing University, Nanjing 210023, China; School of Geography and Ocean Science, Nanjing University, Nanjing 210023, ChinaInternational Institute for Earth System Sciences, Nanjing University, Nanjing 210023, China; School of Geography and Ocean Science, Nanjing University, Nanjing 210023, ChinaSchool of Geography and Ocean Science, Nanjing University, Nanjing 210023, ChinaAccurate representation of photosynthetic capacity and its seasonal variations is critical for modeling carbon sequestration of cropland ecosystems through photosynthesis. Previous studies indicated that the maximum carboxylation rate at 25 °C (Vcmax25) is the key determinant of photosynthetic capacity and can be mapped according to leaf nitrogen (N) and chlorophyll (Chl) contents. However, whether relationships of Vcmax25 with leaf nitrogen and chlorophyll contents in cropland ecosystems change over the whole growing season remain unclear. To address this question, we conducted intensive field campaigns in winter wheat and paddy rice farmlands of Eastern China, with leaf Vcmax25, the maximum electron transport rate at 25 °C (Jmax25), N, and Chl measured every 7 to 10 days from the tillering stage to maturity. Results showed that Vcmax25 and Jmax25 varied significantly during the growing seasons and maximized at flowering stages. For both winter wheat and paddy rice, Chla (Chl content at the area unit) showed significantly different relationships with Vcmax25 pre- and post- flowering while Na (N content at the area unit) did not. When different empirical models were used for pre- flowering and post- flowering stages, Vcmax25 estimated from Chla was closer to observations (R2 = 0.875, RMSE = 9.479 µmol m−2 s−1) than that estimated from Na (R2 = 0.565, RMSE = 17.718 µmol m−2 s−1). The findings in this study imply that the combination of remotely sensed leaf Chla content and phenology would improve the mapping of Vcmax25 for crops at regional and even global scales.http://www.sciencedirect.com/science/article/pii/S1470160X22004897CropVcmax25Jmax25ChlaNaFlowering stage |
| spellingShingle | Jing Li Xuehe Lu Weimin Ju Ji Li Shihua Zhu Yanlian Zhou Seasonal changes of leaf chlorophyll content as a proxy of photosynthetic capacity in winter wheat and paddy rice Ecological Indicators Crop Vcmax25 Jmax25 Chla Na Flowering stage |
| title | Seasonal changes of leaf chlorophyll content as a proxy of photosynthetic capacity in winter wheat and paddy rice |
| title_full | Seasonal changes of leaf chlorophyll content as a proxy of photosynthetic capacity in winter wheat and paddy rice |
| title_fullStr | Seasonal changes of leaf chlorophyll content as a proxy of photosynthetic capacity in winter wheat and paddy rice |
| title_full_unstemmed | Seasonal changes of leaf chlorophyll content as a proxy of photosynthetic capacity in winter wheat and paddy rice |
| title_short | Seasonal changes of leaf chlorophyll content as a proxy of photosynthetic capacity in winter wheat and paddy rice |
| title_sort | seasonal changes of leaf chlorophyll content as a proxy of photosynthetic capacity in winter wheat and paddy rice |
| topic | Crop Vcmax25 Jmax25 Chla Na Flowering stage |
| url | http://www.sciencedirect.com/science/article/pii/S1470160X22004897 |
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