Global variation in the fraction of leaf nitrogen allocated to photosynthesis.
Global variation in the fraction of leaf nitrogen allocated to photosynthesis.
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DOI：
10.1038/s41467-021-25163-9
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发表时间：
2021-08-11
影响因子：
16.6
通讯作者：
Zhang Y
中科院分区：
文献类型：
--
作者：
Luo X;Keenan TF;Chen JM;Croft H;Colin Prentice I;Smith NG;Walker AP;Wang H;Wang R;Xu C;Zhang Y
植物将大量的叶片氮投入到光合酶核酮糖-1,5-二磷酸羧化酶（RuBisCO）中，形成了氮与光合能力的强耦合。氮-光合关系的变异性表明植物的氮利用策略不同（即分配给RuBisCO的氮的比例；fLNR），但其原因尚不清楚，因为光合作用模型中采用的氮利用策略差异很大。在此，我们利用一个综合的原位观测数据库、叶片叶绿素遥感产品和辅助的气候和土壤数据，利用随机森林模型研究了fLNR的全球分布。结果表明，全球fLNR值为18.2±6.2%，其变化主要与叶面积质量负相关，与叶磷正相关。部分气候和土壤因子（光照、大气干燥度、土壤pH和沙粒）对fLNR有显著的正向影响。该研究有助于深入了解全球植物氮与光合作用的关系，提高对光合势全球分布的认识。分配给RuBisCO的叶片氮的比例反映了植物不同的氮利用策略，且差异很大。作者认为，这种变化主要受叶片厚度和磷含量的驱动，光照强度、大气干燥度和土壤pH值也有相当大的影响。
Plants invest a considerable amount of leaf nitrogen in the photosynthetic enzyme ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO), forming a strong coupling of nitrogen and photosynthetic capacity. Variability in the nitrogen-photosynthesis relationship indicates different nitrogen use strategies of plants (i.e., the fraction nitrogen allocated to RuBisCO; fLNR), however, the reason for this remains unclear as widely different nitrogen use strategies are adopted in photosynthesis models. Here, we use a comprehensive database of in situ observations, a remote sensing product of leaf chlorophyll and ancillary climate and soil data, to examine the global distribution in fLNR using a random forest model. We find global fLNR is 18.2 ± 6.2%, with its variation largely driven by negative dependence on leaf mass per area and positive dependence on leaf phosphorus. Some climate and soil factors (i.e., light, atmospheric dryness, soil pH, and sand) have considerable positive influences on fLNR regionally. This study provides insight into the nitrogen-photosynthesis relationship of plants globally and an improved understanding of the global distribution of photosynthetic potential. The fraction of leaf nitrogen allocated to RuBisCO indicates differing nitrogen use strategies of plants and varies considerably. Here the authors show that this variation is largely driven by leaf thickness and phosphorus content with light intensity, atmospheric dryness and soil pH also having considerable influence.
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影响因子：
9.4
作者：
Crous, Kristine Y.;O'Sullivan, Odhran S.;Atkin, Owen K.
通讯作者：
Atkin, Owen K.
影响因子：
11.6
作者：
Kattge, Jens;Knorr, Wolfgang;Wirth, Christian
通讯作者：
Wirth, Christian
影响因子：
13.5
作者：
Croft, H.;Chen, J. M.;Bonal, D.
通讯作者：
Bonal, D.
影响因子：
3.7
作者：
Hengl T;Mendes de Jesus J;Heuvelink GB;Ruiperez Gonzalez M;Kilibarda M;Blagotić A;Shangguan W;Wright MN;Geng X;Bauer-Marschallinger B;Guevara MA;Vargas R;MacMillan RA;Batjes NH;Leenaars JG;Ribeiro E;Wheeler I;Mantel S;Kempen B
通讯作者：
Kempen B
DOI：
10.1073/pnas.1816654116
发表时间：
2019-03-05
影响因子：
11.1
作者：
Bar-On, Yinon M.;Milo, Ron
通讯作者：
Milo, Ron