Papers - MIKI Naoko

Relationship between leaf dynamics and phtosynthetic capacity in Phyllostachys bambusoides Sieb. et Zucc. Reviewed

Takahashi, H, Yamaguchi, Y, Sakamoto, K, Miki, N, Yoshikawa, K

J. Jpn. Soc. Reveget. Tech.   30 ( 1 )   181 - 186   2004

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society of Revegetation Technology  

Seasonal change of leaf number, morphological characteristic of leaves, and photosynthetic rates were measured in Phyllostachys bambusoides. The leaf fall and leaf emerging occurred rapidly and simultaneously from April to May. Young culm retained high leaf density. Old culm retained low leaf density and tended to hold old leaves at high ratio. Therefore, we considered that leaf exchange rate decreased and the leaf longevity increased with an increase of culm age. One year culm had the thickest and largest leaves. Leaves became thinner and smaller with an increase of culm age. Maximum net photosynthetic rates decreased with an increase of culm age. Therefore, the negative correlation was detected between leaf exchange rates and photosynthetic rates, among the culms with different age, which suggested the existence of the trade-off relations.

DOI： 10.7211/jjsrt.30.181

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

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

Journal of Forest Research   8 ( 4 )   303 - 309   2003.11

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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 Reviewed

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

Journal of Forest Research   8 ( 3 )   153 - 161   2003.8

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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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Stand structure of mangrove (Avicennia marina (Forssk.) Vierh.) forests on the coast of gulf of Oman Reviewed

MIKI Naoko, Al-Balushi Bardel, YAMAGUCHI Yasuhito, YOSHIKAWA Ken

Journal of the Japanese Society of Revegetation Technology   29 ( 1 )   125 - 130   2003

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society of Revegetation Technology  

tructures of two mangrove forests of Avicennia marina (Forssk.) Vierh. under different site conditions on the coastal area of gulf of Oman in Arabian Peninsula were investigated in 2003. In Shinas, northern part of the Sultanate of Oman, the mangrove forest of A marina was established along a channel from the sea. The maximum height (H) and the average crown projection area (CPA) of A marina were about 6 m and 1.21 m^2, respectively. A large number of seedlings were growing on the forest floor. On the other hand, H and CPA of A. marina in Quriyat, middle part of Oman, were about 4.5 m and 2.26 m^2, respectively. The mangrove forest in Quriyat was surrounded on two sides by L shaped channel with a blocked mouth to the sea. No seedlings were growing in this land locked mangrove forest. The analysis of spatial distribution of individual trees by the m^*-m relation suggested a random distribution of compact colonies with the size of 25 m^2. Especially such colonial structure of spatial distribution was remarkable in the forest of Shinas with a large number of seedlings.

DOI： 10.7211/jjsrt.29.125

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Diurnal changes of stomatal conductance, transpiration rate, and photosynthetic rate in Pinus densiflora Sieb. Et Zucc. Saplings on different soil water conditions. Reviewed

Miki Naoko, Hirai Akiyo, Sakamoto Keiji, Nishimoto Takashi, Yoshikawa Ken

Journal of the Japanese Society of Revegetation Technology   28 ( 1 )   103 - 108   2002

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society of Revegetation Technology  

To elucidate differences of physiological characteristics in Pinus densiflora Sieb. et Zucc. saplings under different soil water conditions, diurnal changes of the stomatal conductance, the transpiration rate, and the net photosynthetic rate for saplings under pF 1.8- and pF 4.2-soil water condition were measured. pF 4.2-treatment saplings tended to close the stomata and reduce the water loss constantly. However, no distinct differences in the net photosynthetic rates were observed between soil water conditions. These results suggested that pF 4.2-treatment saplings under long-term water stress maintained the high net photosynthetic rates with reducing water loss.

DOI： 10.7211/jjsrt.28.103

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

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

Journal of Forest Research   6 ( 3 )   181 - 186   2001.8

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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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