Developing Ozone Risk Assessment for Larch Species
Developing Ozone Risk Assessment for Larch Species
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DOI：
10.3389/ffgc.2020.00045
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发表时间：
2020-05-12
影响因子：
3.2
通讯作者：
Koike, Takayoshi
中科院分区：
文献类型：
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作者：
Hoshika, Yasutomo;Paoletti, Elena;Koike, Takayoshi
为保护森林而进行的臭氧（O-3）风险评估要求根据生长季节中O-3浓度（AOT 40）或气孔吸收（PODY）的积累确定特定物种的临界水平。落叶松（Larix sp.）是北方广泛分布的一个O-3敏感的属，具有全球经济意义。分析了日本落叶松（Larix kaempferi）及其杂种F-1（Larix gmelinii var.粳稻的气孔导度模型参数化，并采用两个Y阈值，即0和1 nmol m（-2）s（-1）投影叶面积（PLA），估算基于PODY的CL。同时，我们估计了基于AOT 40的CL。结果表明，在生物量损失2%和4%时，日本落叶松AOT 40的CL值分别为5.79和11.59 ppm h，高于杂种落叶松F-1的CL值（2.18和4.36 ppm h AOT 40），表明杂种落叶松对O-3的敏感性较高。然而，PODY的使用调和了种特异性差异，因为CL相似，即日本落叶松的9.40和12.00 mmol m（-2）POD 0和2.21和4.31 mmol m（-2）POD 1与杂种的10.44和12.38 mmol m（-2）POD 0和2.45和4.19 mmol m（-2）POD 1，生物量损失分别为2%和4%。总体而言，CL低于其他森林物种，这表明这些落叶松相对较高的敏感性。这些结果将告知环境政策制定者和模型关于落叶松的敏感性O-3。
Ozone (O-3) risk assessment for the protection of forests requires species-specific critical levels (CLs), based on either O-3 concentrations (AOT40) or stomatal uptake (PODY) accumulation over the growing season. Larch (Larix sp.) is a genus with O-3-susceptible species, widely distributed in the northern hemisphere and with global economic importance. We analyzed published and unpublished data of Japanese larch (Larix kaempferi) and its hybrid F-1 (Larix gmelinii var. japonica x L. kaempferi) stomatal responses for developing a parameterization of stomatal conductance model and estimating PODY-based CLs with two Y thresholds, that is, 0 and 1 nmol m(-2) s(-1) projected leaf area (PLA). In parallel, we estimated AOT40-based CLs. The results show that the AOT40-based CLs for a 2% and 4% biomass loss in Japanese larch were 5.79 and 11.59 ppm h, that is, higher than those in hybrid larch F-1 (2.18 and 4.36 ppm h AOT40), suggesting a higher O-3 susceptibility of the hybrid. However, the use of PODY reconciled the species-specific differences, because the CLs were similar, that is, 9.40 and 12.00 mmol m(-2) POD0 and 2.21 and 4.31 mmol m(-2) POD1 in Japanese larch versus 10.44 and 12.38 mmol m(-2) POD0 and 2.45 and 4.19 mmol m(-2) POD1 in the hybrid, for 2% and 4% biomass loss, respectively. Overall, the CLs were lower than those in other forest species, which suggests a relatively high susceptibility of these larches. These results will inform environmental policy-makers and modelers about larch susceptibility to O-3.