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The Science of Nature - 相似文献
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Effects of different mobilities of leaf and woody litters on litter carbon dynamics in arid ecosystems in Western Australia 总被引:1,自引:0,他引:1
Shungo Kumada Takuya Kawanishi Yoshishige Hayashi Hiroyuki Hamano Satoko Kawarasaki Shin-ichi Aikawa Nobuhide Takahashi Yasuyuki Egashira Hiroyuki Tanouchi Toshinori Kojima Adrianne Kinnear Koichi Yamada 《Ecological modelling》2009,220(20):2792-2801
Afforestation of arid land is a promising countermeasure against global warming. We had previously found, through modeling and mass balance analyses of an arid land afforestation experimental project in Western Australia, that a significant amount of litter could have been physically removed from the floors of natural forests. In order to analyze litter carbon dynamics in depth, we investigated the actual mobility of litter in several natural forests in Sturt Meadows in an arid region of Western Australia, and estimated the difference between the removal rate of leaf and woody (twigs and branches) litter on the forest floor. Then we redeveloped a litter carbon dynamics model by incorporating physical removal of litter to show the different mobilities of leaf and woody litters. We also analyzed carbon balances and the effect of differential litter mobility on litter carbon dynamics. Except for twigs in one plot in a high density forest, 29–100% of leaf litter and 10–100% of woody litter was removed annually, demonstrating the physical removal of litter in these natural forests. The main cause of litter removal was wind, not flooding. Decreases in leaf and woody litters could be approximated as first order decay functions in most plots; first order decay or disappearance rate constants were then determined. Estimated disappearance rate constants of leaf and woody litter ranged from 0.19 to 11 and 0.11–12 year−1, respectively; most of the constants ranged from 0.19 to 2.0 and 0.11–0.74 year−1, respectively. Based on the disappearance rate constant, the mobility of woody litter was estimated to be roughly 20% that of leaf litter, confirming that climatic factors move leaves more easily than twigs. The improved model, which took into account the different mobilities of leaf and woody litters, showed that annual physical removal of litter reached 70–82% of the annual litter fall in Acacia aneura forests, and that roughly 40–60% of the existing litter was removed annually from all sites. Incorporating into the model the difference in mobilities of leaf and woody litters showed that the ratio of annual litter removal to annual litter fall increased about 10% points compared with the assumption of that both litter types had equal mobility. 相似文献
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Miyamoto Shintaro Hayashi Kensuke Naruse Daiki Hosokawa Yoshifumi Minagawa Hiroshi Hisada Makoto 《Journal of Material Cycles and Waste Management》2022,24(4):1396-1406
Journal of Material Cycles and Waste Management - Although fly ash, as used for supplementary cementitious material in Portland cement concrete, can reduce the heat of hydration and suppress the... 相似文献
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Tomoyoshi?HirotaEmail author Kazuei?Usuki Masaki?Hayashi Manabu?Nemoto Yukiyoshi?Iwata Yosuke?Yanai Tomotsugu?Yazaki Satoshi?Inoue 《Mitigation and Adaptation Strategies for Global Change》2011,16(7):791-802
In the northernmost region of Japan (Hokkaido Island), earlier onsets of thick snowcover in recent years (post 1980) have
reduced the penetration depth of soil frost, resulting in over-winter survival of unharvested small potato (Solanum tuberosum) tubers that emerge as weeds in the spring in rotation crop fields. To prevent the occurrence of potato weeds, a method was
developed to manipulate soil-frost depths by artificially controlling snowcover thickness, guided by a simple numerical model
that simulates soil freezing-thawing processes using daily mean air temperature and snowcover thinckness as input variables.
The method involves removal of snowcover to expose the soil surface in the beginning of winter until the soil freezes to a
sufficient depth. After that time, snow is deposited back or allowed to accumulate naturally to prevent further penetration
of frost, which may cause undesirable delay in the seeding of spring crops. Field trials indicated that the model predicted
frost depths within several centimeters of observed values, when measured temperature and snowcover thickness were used as
model input. Based on the field and laboratory data, a soil temperature of −3°C is necessary for complete elimination of potato
tubers. To achieve this temperature in potato-burial zones without causing excessive freezing, an optimal frost depth is 0.3
to 0.4 m. The method is being adopted by progressive potato producers in the region, who use tractor-mounted snow ploughs
to manipulate snowcover over a large scale. This is an emerging new technology for agricultural adaptation to climate variability. 相似文献
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