担当区分：責任著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Japan Society of Tropical Ecology  

DOI： 10.3759/tropics.20.11

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担当区分：責任著者   記述言語：英語   出版者・発行元：日本熱帯生態学会  

DOI： 10.3759/tropics.19.93

CiNii Books

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：SPRINGER JAPAN KK  

We studied vegetation changes in a small floating mat bog in Mizorogaike Pond (Kyoto, Japan), which had experienced a severe decrease in the number and area of hummocks caused by nutrient loading in the 1960s and 1970s, to examine whether reducing the extent of nutrient loading can restore degraded wetland vegetation. However, nutrient loading in the region has been minimized since the 1980s. We examined the distributions of hummocks and Sphagnum cuspidatum mats in 1980, 1988, and 2006, as well as nine major vascular plants that dominated the hollows on the floating mat in 1980 and 2006. The total area of normal hummocks formed by Sphagnum palustre increased from 5865.3 m(2) in 1980 to 5913.6 m(2) in 1988 and 8485.2 m(2) in 2006. The total area of the S. cuspidatum mats also changed, from 416.4 m(2) in 1980 to 322.3 m(2) in 1988 and 1012.5 m(2) in 2006. Examination of the spatial distribution patterns of major plants revealed that emergent plants decreased in the northern part of the mat, but increased in the southern part. Thus, the improved pond water quality was effective at restoring hummocks, although nutrient loading may have caused some irreversible changes in the wetland vegetation.

DOI： 10.1007/s10201-010-0312-6

Web of Science

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記述言語：英語   出版者・発行元：Society of Agricultural Meteorology of Japan  

DOI： 10.2480/agrmet.66.3.1

J-GLOBAL

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We investigated soil net nitrogen mineralization rate, above- and belowground biomass allocation, and nitrogen use in a Cryptomeria japonica plantation chronosequence. Total biomass accumulation showed an asymptotic accretion pattern, and the peak total biomass accumulation rate occurred approximately 30 years after afforestation. Soil net nitrogen mineralization rate was lowest 30 years after afforestation. Between years 30 and 88, net nitrogen mineralization increased again. These results indicate that an imbalance in soil nitrogen supply and plant nitrogen demand occurred approximately 30 years after afforestation. Furthermore, leaf nitrogen concentration, which was used as an index of plant nitrogen status, was lower in mature forest than in young forest, suggesting that mature stands did not take up nitrogen as successfully. If soil resources such as nitrogen limit plant growth, plants may increase biomass allocation to fine root structure; however, fine root biomass was not higher in 30- and 88-year-old stands than in younger stands, suggesting that changes in biomass allocation may not be effective against nitrogen deficiency in a C. japonica plantation chronosequence. © The Japanese Forest Society and Springer 2009.

DOI： 10.1007/s10310-009-0135-7

Scopus

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掲載種別：研究論文（学術雑誌）  

DOI： 10.18960/hozen.14.2_153

Scopus

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その他リンク： http://orcid.org/0000-0002-7070-616X

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

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記述言語：日本語  

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記述言語：英語   掲載種別：論文集(書籍)内論文   出版者・発行元：World Scientific Publishing Co.  

Artificial nutrient loading has been linked to the decrease in plant diversity in peatlands, riparian areas, and swamps. Mizoro-ga-ike pond is one of the natural monuments of Japan and contains temperate floating mat and diverse plant community. The pond had experienced eutrophication by sewage and tap water. As the inflows of nutrient-rich water had been lessened, the amount of source area of the pond has decreased to 30%. We investigated factors that control water chemistry in and around the pond to assess the present situation of the pond. The pond has two mouths of inflows. One of the inflows includes leaked water from a tap water reserver. The other is the surface flow collected by a ditch. The result of water quality census indicates the pond has two sources of nutrient-rich water. One is the drainage from the surface water polluted by the road for automobile that flows into the northern coast of the pond, and the other is the tap water-contaminated water entering from the southern coast. Also the result of the census indicates that emergent plants such as reeds and wild rice modify the effect of nutrient-rich water by exploiting nutrients. Especially, it was suggested that the nursery effects of emergent grasslands that spread southern part of the pond protect the less robust plants, Nuphar subintegerrimum.

DOI： 10.1142/9789812708915_0013

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：京都大学大学院アジア・アフリカ地域研究研究科  

Although carbon storage in ecosystems and biological diversity have been central issues of environmental and ecological sciences for a decade, a reciprocal relationship between diversity and productivity of ecosystems is still unknown. To reveal such the reciprocal relationship, we measured the microtopography around some tree groups, estimated fl ows and stocks of organic matters in soils in the form of litters and roots under three kinds of microtopographic conditions, measured decomposition rates, and detected the shift of distribution patterns of dominant species among growing stages in relation to locations of tree groups creating specifi c microtopographic conditions in a tropical peat swamp forest. The results suggest that heterogeneity of peat accumulation rate results in undulating peat surface. Such undulating peat surface contributes to habitat differentiation of tree species, because subtle difference in peat surface elevation determines the degree of fl ooding, which affects survival rates of plants differently according to species. Such the distribution of plant species formed through the above process determines local regime of organic matter dynamics that determines peat surface conditions of near futures. Thus, in tropical peat swamp forests diversity and productivity were closely interdependent to each other, although the diversity has attracted less attention than carbon storage function.

CiNii Books

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その他リンク： http://hdl.handle.net/2433/80085

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：SPRINGER TOKYO  

Spatial and temporal ground-surface dynamics are major factors that affect regeneration and species coexistence in tropical peat swamp forests. We studied the seedling survivorship and morphological features of two tree species that play important roles in maintaining the ground-surface dynamics of a peat swamp forest in Sumatra. Large Swintonia glauca trees form mounds, whereas large Stemonurus scorpioides trees occupy non-mounds. We monitored the demography of naturally dispersed Swintonia and Stemonurus seedlings that germinated in 2000. Survivorship of Swintonia seedlings was high under conditions of late germination, high-light environment, and elevated ground surface, and was negatively affected by distance to the nearest conspecific adult. Survivorship of Stemonurus was high under conditions of early germination and high conspecific seedling density, and was also negatively affected by distance to the nearest conspecific adult. The allometric features of Stemonurus seedlings indicated characteristics of stress tolerance, that is, low growth rate and thick, porous roots. Stemonurus, which has large wingless seeds, regenerated in non-mounds around the parental trees, while winged Swintonia seeds dispersed farther from the parent and established in patchily distributed gaps and mounds. Thus, Swintonia seedlings can survive on non-mound sites within gaps and possibly create mounds, while Stemonurus seedlings tend to maintain non-mounds around the parental trees.

DOI： 10.1007/s11284-006-0185-7

Web of Science

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記述言語：英語  

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記述言語：日本語   掲載種別：研究論文（大学，研究機関等紀要）  

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ROYAL SOCIETY  

We studied the relationship between the coexistence of tree species and the dynamics of organic matter in forests. A tropical peat swamp forest was selected as a model ecosystem, where abiotic factors, such as geological topography or parent rock types, are homogeneous and only biological processes create habitat heterogeneity. The temporal or spatial variation of the ground elevation of peat soils is mainly caused by changes in the balance between organic matter inputs to soils and decomposition, which is affected by the growth and death of influential trees. To clarify the processes of elevation dynamics, we measured the microtopography around some tree groups, estimated organic matter (in the form of litter and roots) in soils under three kinds of microtopographic conditions, measured decomposition rates and detected dominant species' shifting distribution patterns in different stages of growth in relation to the locations of tree groups creating specific microtopographic conditions. We found that growth or death of buttressed trees has the greatest effects on the rising or sinking of ground surfaces through changes in litter supply and root production. We discuss here the possibility of extending our model to other forest types.

DOI： 10.1098/rspb.2005.3095

Web of Science

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掲載種別：研究論文（国際会議プロシーディングス）  

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：京都大学東南アジア研究センター  

この論文は国立情報学研究所の学術雑誌公開支援事業により電子化されました。

DOI： 10.20495/tak.40.1_74

CiNii Books

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その他リンク： http://hdl.handle.net/2433/53719

記述言語：日本語  

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記述言語：日本語  

DOI： 10.11519/jfsc.118.0.685.0

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記述言語：日本語   出版者・発行元：日本陸水学会  

DOI： 10.14903/jslim.71.0.174.0

J-GLOBAL

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記述言語：英語  

J-GLOBAL

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記述言語：日本語  

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記述言語：日本語  

DOI： 10.14848/esj.ESJ52.0.281.0

J-GLOBAL

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記述言語：日本語   出版者・発行元：日本生態学会  

森林生態系の物質循環において粗大木質有機物は様々な役割を果たしていると考えられている。特に葉リターなどと比較して粗大木質有機物は分解に長い期間を必要とする。そのため、養分の吸収源や供給源として長い期間作用する。これまで地上部の粗大木質有機物の分解過程と養分動態に関する研究は数多くあるが、地下部に存在する粗大木質有機物については研究例が少なく、長期の分解過程と物質動態に関する情報は限られている。地下部にある木質の有機物は土壌中に埋もれている。そのため、分解に伴う物質動態も地上部・地下部で異なるパターンが予想され、森林生態系の物質循環におけるそれぞれの役割の違いが期待される。<br>奈良県吉野郡十津川村にある三興林業のスギの造林地では約90年を伐期として集水域単位で大規模な皆伐、植林が行われている。それぞれの林齢の森林が隣接しているために同一気候で、地質や地形の差が小さい。ここでは１年生から90年生の皆伐後の森林動態を同時に追跡することが出来る。そこで、材の地上部と地下部の分解過程とそれに伴う物質動態の違いを明らかにするために、皆伐植裁直後・5年・15年・30年・41年経過したスギ人工林から、各５つずつ切り株を選定し、その分解過程を追跡した。各切り株の地上部の芯材・辺材・地下部の根について、有機画分の重量変化についての分析を行った。<br>有機画分の分析の結果、リグニンの濃度が地下部で高いことが示された。また、LCI（リグノセルロース指数）は窒素濃度と負の相関を持ち、窒素によるリグニン分解の抑制が示された。発表では含水率・無機養分・容積重・重量減少・室内培養による材の呼吸量の測定結果なども含めて考察する予定である。

DOI： 10.14848/esj.ESJ52.0.297.0

J-GLOBAL

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