論文 - 三木　直子

マダケ（Phyllostachys bambusoides Sieb. et Zucc.）の稈の葉群動態と個葉の光合成特性について 査読

高橋宏和, 山口康人, 坂本圭児, 三木直子, 吉川 賢

日本緑化工学会誌   30 ( 1 )   181 - 186   2004年

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本緑化工学会  

マダケの葉量の季節変化,葉の形態,光合成速度に関する測定を行った。マダケの落葉と展葉は,4月から5月にかけて同時に起こった。齢の若い稈で多くの葉量を保ち,齢の古い稈では,少ない葉量を維持した。稈の齢が古くなるにつれて,古い葉を高い割合で残す傾向がみられ,葉替わりは緩やかになり葉の寿命が長くなると考えられる。葉の形態では,1年生の稈で最も大きく厚い葉をつけ,その後稈の齢の増加に伴い,より小さく薄い葉に変わっていた。光合成速度は,稈の齢が若いほど高かった。したがって,マダケでは稈の齢の違いによって,葉の寿命,あるいは葉の入れ替わりの早さと光合成速度の間には負の関係がみられ,トレードオフの関係のあることが示唆された。

DOI： 10.7211/jjsrt.30.181

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00242821487?from=CiNii

Comparison of stand dynamics after dieback caused by pine wilt disease among pine forests with different management regimes in western Japan 査読

Keiji Sakamoto, Naoko Miki, Taiyo Tsuzuki, Takashi Nishimoto, Ken Yoshikawa

Journal of Forest Research   8 ( 4 )   303 - 309   2003年11月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

In pine forests damaged by pine wilt disease, in western Japan, the effect of protection regimes of pine trees on the stand dynamics were examined in the following four stands: (1) lightly damaged stand (age 30-40 years) with no procedure in operation for protecting pine trees
(2) severely damaged stand (age 30-40 years) with no procedure in place for protecting pine trees
(3) severely damaged stand (age 50 years) with a selective cutting of infected trees
(4) severely damaged stand (age 30-40 years) with a selective cutting of infected trees. All the stands had been abandoned before the pine wilt disease damage. The understory structure of the severely damaged stand with no protection procedure was similar to that of the lightly damaged stand. Frequent invasion by tree species and acceleration in the growth of understory trees occurred after the dieback in the selective cutting stand. These results suggest that a deficiency in the canopy layer caused by the dieback resulted in low disturbance intensity in the early stages after the die-back, but the selective cutting increased the intensity by the reduction in the understory as well as the canopy layer. The intensity of the disturbance in the selective cutting stands was larger in the younger stand because it had a higher density of selectively cut pine trees. The different stand structure of pine forests occurred after the dieback because the intensity of the disturbance varied as a result of the selective cutting operation and the stand age.

DOI： 10.1007/s10310-003-0044-0

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Leaf water relations in Pinus densiflora Sieb. et Zucc. on different soil moisture conditions 査読

Naoko Miki, Kosei Otsuki, Keiji Sakamoto, Takashi Nishimoto, Ken Yoshikawa

Journal of Forest Research   8 ( 3 )   153 - 161   2003年8月

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

To elucidate the differences in the leaf water relations of Pinus densiflora Sieb, et Zucc. growing in different soil moisture conditions, we examined the pressure-volume curve and the diurnal changes in the stomatal conductance, the transpiration rate, and the leaf water potential. The leaf water relations were compared using field-grown 40-year-old pine trees growing on the upper and lower parts of a slope. We also compared the leaf water relations of potted 4-year-old saplings growing at pF 4.2 and pF 1.8 soil moisture levels for almost 1 year. The values of the ratio of symplasmic water at turgor loss point to symplasmic water at saturated point (V p/Vo) and bulk modulus of elasticity (ε) of both the adult trees on the upper part of the slope and the potted saplings growing on pF 4.2 soil moisture were higher than those values of both the adult trees on the lower part of the slope and the potted saplings growing on pF 1.8 soil moisture, respectively. The field-grown adult tree and the potted saplings growing under long-term water stress tended to reduce their stomatal conductance in response to the acute soil drying. It is suggested that P. densiflora growing under long-term water stress rapidly closed its stomata in response to soil drying and avoided losing water, and could also rapidly absorb water with reducing water loss because of the decrease in the leaf pressure potential derived from the high ε values.

DOI： 10.1007/s10310-002-0021-z

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オマーン湾沿岸に分布するヒルギダマシ（Avicennia marina (Forssk.) Vierh.）林の林分構造 査読

三木直子, Bardel Al-Balushi, 山口康人, 吉川 賢

日本緑化工学会誌   29 ( 1 )   125 - 130   2003年

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本緑化工学会  

アラビア半島南部のオマーン湾沿岸に分布するヒルギダマシ(Avicennia marina (Forssk.) Vierh.)林において,林分構造の調査を行った。その結果,海に通じた水路沿いに発達したShinasのヒルギダマシ林では最大樹高は約6m,平均樹冠投影面積は1.21m^2であった。林床には多数の実生が生育していた。一方,水路が海とつながっておらず,陸封された状態にあるQuriyatでは,最大樹高は4.5m,平均樹冠投影面積は2.26m^2で,実生は全く見られなかった。両調査地ともに25m^2の大きさのコンパクトなコロニーがランダムに分布する空間分布の特性を示した。特に,実生が多数発生しているShinasではコロニー構造が顕著であった。

DOI： 10.7211/jjsrt.29.125

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00231954233?from=CiNii

異なる土壌水分条件下で生育したアカマツ苗木の気孔コンダクタンス，蒸散速度および光合成速度の日変化 査読

三木直子, 平井晃余, 坂本圭児, 西本 孝, 吉川 賢

日本緑化工学会誌   28 ( 1 )   103 - 108   2002年

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本緑化工学会  

生育土壌の水分条件が異なるアカマツ(Pinus densiflora Sieb.et Zucc.)苗木の生理特性の違いを明らかにすることを目的として,pF1.8とpF4,2の土壌水分条件下で育てたアカマツ苗木の気孔コンダクタンス,蒸散速度および純光合成速度の日変化を測定した。その結果,pF4.2処理区の個体は,水ストレスに対して気孔を閉鎖して失水を抑える日変化を示した。しかし,純光合成速度は一日中pF1.8処理区と同程度の値を維持していた。気孔開度が等しいときの純光合成速度を比較しても,pF4.2処理区の個体の方が有意に高かった。このことから,慢性的に水ストレスを受けて生育したpF4,2処理区の個体は,pF1.8処理区の個体よりも少ない水分消費で高い光合成活性を維持できる水分低消費型であることが示唆された。

DOI： 10.7211/jjsrt.28.103

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00158618645?from=CiNii

Relationship between the incidence of pine wilt disease and the drainage area 査読

Naoko Miki, Keiji Sakamoto, Takashi Nishimoto, Ken Yoshikawa, Yoshio Hada

Journal of Forest Research   6 ( 3 )   181 - 186   2001年8月

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

We examined the relationship between the incidence of pine wilt disease and moisture conditions in the stand level of Pinus densiflora Sieb. et Zucc. forests in the warm-temperate zone of the western part of Japan. For this analysis, pine trees killed by pine wilt disease were distinguished from the suppressed trees by their position in the layer of the pine forest stand. The drainage area, which is small in the upper part and large in the lower part of the slope, was adopted for representing the moisture conditions in the soil of the slope. The percentage of the pine trees killed by pine wilt disease increased as the size of the drainage area increased. This result suggested that the incidence of pine wilt disease tended to be high in areas with moist conditions. Pine trees attacked by the pinewood nematode die from extensive water deficit due to tracheid cavitations. Pine wilt disease mainly emerges in the summer when the soil water conditions become especially severe, and the radical water stress is thought to accelerate the disease. It was assumed that pine trees in the plots with the small drainage area resisted the influence of the attack of the pinewood nematode because pine trees in the plots with the small drainage area encountered long-term water stress and acquired drought tolerance. Pine trees in the plots with the large drainage area were presumed to be well established in the moist conditions and not to have acquired drought tolerance. The drought tolerance of pine trees was thought to be an important factor in resistance to pine wilt disease.

DOI： 10.1007/BF02767090

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