Limits on aboveground net primary production, leaf area, and biomass in vegetational zones of the Pacific Northwest
Limits on aboveground net primary production, leaf area, and biomass in vegetational zones of the Pacific Northwest
复制标题
太平洋西北部植被区地上净初级生产力、叶面积和生物量的限制
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发表时间：
1979
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影响因子：
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通讯作者：
H. Gholz
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作者：
H. Gholz
批准：Richard H4r从俄勒冈州和华盛顿州12个主要植被带中的8个(约占两个州面积的80%)中的8个成熟植被样本，沿着从太平洋海岸到喀斯喀特山脉东坡的纬向横断面进行研究。林区有6个林分，林地和灌丛草原各有1个林分。地上净第一性生产量(NPP)为0.3~14.7tha-1/a，地上生物量为3~1500tha-1，叶面积为1~40ha-1，灌丛草原带最小，沿海林带最大。沿海白天的平均气温低于-2℃，仅为冬季的2%，而灌木草原的这一比例为87%。尽管年降雨量在灌丛草原的20厘米到沿海的260厘米之间，但它对林分结构和产量的预测相对较差。7个植被带的最大叶面积与简单的生长季水分平衡密切相关。在亚高山针叶林地带，叶面积受到温度的限制。在水分平衡成分中，单是蒸发量就能解释叶面积变化的95%。当叶面积达到20ha ha-1时，生物量和净初级生产力与叶面积呈线性增加。随着叶面积的增加，生物量继续增加。NPP也与1月份的最低气温呈线性相关。除沿海林区外，任何给定叶面积的净初级生产力都低于世界其他地方其他成熟系统的最大值。亨利·刘易斯·霍尔茨在太平洋西北部植被带对地上净初级生产力、叶面积和生物量的限制向俄勒冈州立大学提交的部分满足哲学博士学位要求的论文1979年6月开始
approved: Richard H4rWaring Samples of mature vegetation from 8 of 12 major vegetational zones in Oregon and Washington, representing about 80% of the area of the two states, were studied along a latitudinal transect from the Pacific Coast to the east slopes of the Cascade Mountains. Six stands were in forest zones, one in woodland and one in the shrub-steppe. Aboveground net primary production (NPP, estimated as the sum of stem, branch, and foliage production) ranged from 0.3 to 14.7 t ha -1 yr-1 , aboveground biomass from 3 to 1500 t ha-1 , and area of all sides of leaves from 1 to 40 ha ha-1, with minimums in the shrub-steppe zone and maximums in the coastal forest zone. Average day air temperatures were less than -2°C only 2% of the winter at the coast, contrasted to 87% in the shrub-steppe. Although annual precipitation ranged from 20 cm in the shrub-steppe to 260 cm at the coast, it was a relatively poor predictor of stand structure and production. Maximum leaf areas were closely related to a simple growing season water balance in seven vegetational zones. In the subalpine conifer zone, leaf area appeared limited by temperature. Of the water balance components, evaporative demand alone accounted for 95% of the variance in leaf area. Biomass and NPP increased linearly with leaf area up to a leaf area of 20 ha ha-1 . Biomass continued to increase with increasing leaf areas. NPP was also linearly related to minimum January temperatures. Except in the coastal forest zones, NPP for any given leaf area was less than maximum values reported for other mature systems elsewhere in the world. Limits on Aboveground Net Primary Production, Leaf Area, and Biomass in Vegetational Zones of the Pacific Northwest by Henry Lewis Gholz A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy Commencement June 1979