Jr Ronald S Zalesny, Zhu J Y, Headlee William L, Gleisner Roland, Pilipović Andrej, Acker Joris Van, Bauer Edmund O, Birr Bruce A, Wiese Adam H
USDA Forest Service, Northern Research Station, Rhinelander, WI 54501, USA.
USDA Forest Service, Forest Products Laboratory, Madison, WI 53726, USA.
Plants (Basel). 2020 Oct 14;9(10):1357. doi: 10.3390/plants9101357.
Long-term poplar phytoremediation data are lacking, especially for ecosystem services throughout rotations. We tested for rotation-age differences in biomass productivity and carbon storage of clones Bartr. ex Marsh × L. 'DN34' and × A. Henry 'NM6' grown for landfill phytoremediation in Rhinelander, WI, USA (45.6° N, 89.4° W). We evaluated tree height and diameter, carbon isotope discrimination (Δ), and phytoaccumulation and phytoextraction of carbon, nitrogen, and inorganic pollutants in leaves, boles, and branches. We measured specific gravity and fiber composition, and determined biofuels recalcitrance of the Rhinelander landfill trees versus these genotypes that were grown for biomass production on an agricultural site in Escanaba, MI, USA (45.8° N, 87.2° W). 'NM6' exhibited 3.4 times greater biomass productivity and carbon storage than 'DN34', yet both of the clones had similar Δ, which differed for tree age rather than genotype. Phytoaccumulation and phytoextraction were clone- and tissue-specific. 'DN34' generally had higher pollutant concentrations. Across contaminants, stand-level mean annual uptake was 28 to 657% greater for 'NM6', which indicated its phytoremediation superiority. Site-related factors (not genotypic effects) governed bioconversion potential. Rhinelander phytoremediation trees exhibited 15% greater lignin than Escanaba biomass trees, contributing to 46% lower glucose yield for Rhinelander trees.
长期的杨树植物修复数据匮乏，尤其是关于整个轮作周期内生态系统服务的数据。我们测试了在美国威斯康星州莱茵兰德（北纬45.6°，西经89.4°）用于垃圾填埋场植物修复的无性系Bartr. ex Marsh × L. 'DN34'和× A. Henry 'NM6'在轮作年龄上生物量生产力和碳储存的差异。我们评估了树高和直径、碳同位素分馏（Δ），以及叶片、树干和树枝中碳、氮和无机污染物的植物累积和植物提取。我们测量了比重和纤维成分，并确定了莱茵兰德垃圾填埋场树木与在美国密歇根州埃斯卡纳巴（北纬45.8°，西经87.2°）一个农业场地用于生物量生产的这些基因型树木相比的生物燃料抗降解性。'NM6'的生物量生产力和碳储存比'DN34'高3.4倍，但两个无性系的Δ相似，其因树龄而非基因型而异。植物累积和植物提取具有无性系和组织特异性。'DN34'的污染物浓度通常更高。在所有污染物中，'NM6'的林分水平年均吸收量高出28%至657%，这表明其在植物修复方面具有优势。与场地相关的因素（而非基因型效应）决定了生物转化潜力。莱茵兰德植物修复树木的木质素比埃斯卡纳巴生物量树木高15%，这导致莱茵兰德树木的葡萄糖产量降低46%。
