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Journal of Crop Science and Biotechnology - We examined the effects of drought stress on flowering time, grain yield, and agronomic traits using 10 upland-adapted rice genotypes, i.e. eight... 相似文献
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武夷山风景名胜区景观类型空间关系及其尺度效应初探 总被引：9，自引：1，他引：9
对武夷山风景名胜区景观类型空间关系及其尺度效应研究结果表明 ,景观类型空间关系存在尺度效应 ,尺度变化对破碎化程度高的景观类型空间关系影响较大 ,而对破碎化程度低的景观类型空间关系影响较小。研究景观类型空间关系时其取样尺度不宜太大 ,武夷山风景名胜区以 2 0 0m× 2 0 0m取样尺度最佳。武夷山风景名胜区景观类型空间关系特征为低海拔高度区呈现出以居民点为中心的由农田、河流等向周围扩散的干扰景观格局 ,而中高海拔高度区则呈以近成熟、成过熟林占优势的天然马尾松林为主体的人为干扰较小的天然景观格局 相似文献
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Dong-Jin Kang Akira Endo Young-Jin Seo 《Journal of Crop Science and Biotechnology》2013,16(3):219-223
We investigated the possibility of tsunami-damaged paddy soil remediation in Japan using a scraping method. We collected undisturbed soil blocks to maintain the soil structure from paddy damaged by salt from the tsunami. Scraping treatments to remove the top 2 cm of the soil surface were conducted once, twice, and thrice after drying naturally in a greenhouse environment, as well as a noscraping control. Electrical conductivity (EC) of the soil dramatically decreased to < 1.36 dS m?1 in the residual soils after scraping. The EC values of the residual soils were significantly lower after being scraped twice or thrice compared with a single scraping. Similarly, the mean NaCl removal rates were significantly higher with two (91%) or three scrapings (97.2%) compared with a single scraping (73.3%). The growth of rice plants was almost normal in the residual soils based on a visual score (approximately 3 on average) using a standard evaluation system at 4 weeks after transplantation. There were no significant differences in the grain yields from the residual soils with different scraping frequencies, and the EC values of all the residual soils were < 1.36 dS m?1. This study clearly indicates that there were reductions in the EC and good plant growth performance in the residual soils after scraping, and there was also a high rate of NaCl removal. Therefore, scraping may be a useful method for the remediation of salt-damaged paddy soils when irrigation or culvert systems are affected severely by tsunamis and earthquakes. 相似文献
4.
Young-Hee Lee Eun-Kyung Hwang Young-Mee Baek Mee-Sung Lee Dong-Jin Lee Young-Jin Jung Han-Do Kim 《Fibers and Polymers》2013,14(9):1445-1453
Natural dye extracts were obtained by extraction from Punica granatum L. using water as an extractant at 90 °C for 90 min with various liquor ratios (solid Punica granatum L.(wt.): solvent water(wt.); 1:100–1:5). Dyeing was carried out using a 1:50 dyeing bath ratio at 80 °C for 60 min by exhaustion method. This study focused on the effect of liquor ratio on dyeing properties and deodorizing/antibacterial performance of various fabrics (cotton, silk and wool) dyed with Punica granatum L. extract without mordants. The optimum liquor ratio was found to be 1:10. By IR, UV-visible spectroscopies and HPLC analysis, the main component in Punica granatum L. extract and the yellow colorant component were found to be ellagic acid. By GC/MS analysis, the major volatile components of pristine Punica granatum L. powder were found to be acetic acid (area: 25.84 %), ethanol (area: 17.97 %), acetoin (area: 13.11 %), acetaldehyde (area: 8.96 %), isobutanal (area: 4.90 %). All dyed fabrics (cotton, silk and wool fabrics) displayed outstanding deodorizing performance (99 %) against ammonia gas and excellent antibacterial performance (bacteriostatic reduction rate: 99.9 %) against Staphylococcu aureus and Klebsiella pneumoniae. 相似文献
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Dong-Jin Kang Tomoko M. Nakanishi Tamikazu Kume Ryuichi Ishii 《Journal of Crop Science and Biotechnology》2009,12(4):261-265
The visual symptoms of damage by acid sulfate soil look quite similar to those due to soil moisture deficit. The present paper
is to confirm if acid soil-tolerance is associated with drought tolerance in terms of leaf water potential, transpiration,
and dry matter production. Seedlings of seven acid soil-tolerant (acid-tolerant), and three acid soil-intolerant varieties
(acid-intolerant) were subjected to low pH conditions (pH 3.8) for 48 hours. The rate of water uptake was determined continuously
by measuring radioactivity in the collar part (target area) of rice leaves exposed to 18F-labeled water (18F-water) using a Positron Emitting Tracer Imaging System (PETIS). The PETIS measurement showed that the radioactivity in the
target position of leaves of acid-tolerant varieties increased faster than that of the intolerant varieties after the 18F-water was applied into the vial. In the plants subjected to low pH conditions, the transpiration rate (Tr) and leaf water
potential (Ψ) decreased in both acid-tolerant and intolerant varieties. However, the extent of reduction was less in the acid-tolerant
varieties than in the intolerant ones. Moreover, the dry matter production rate of the acid-tolerant varieties was significantly
higher than that of the acid-intolerant ones in the low pH conditions. This study clearly shows that 18F-water uptake in a leaf was higher, and water relations were also better maintained in the acid-tolerant varieties compared
with intolerant ones, resulting in higher growth rate in the acid-tolerant varieties, when plants were exposed to the acid
solution conditions. We conclude that acid soil-tolerance is closely associated with leaf water relations in rice plants. 相似文献
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Sazio PJ Amezcua-Correa A Finlayson CE Hayes JR Scheidemantel TJ Baril NF Jackson BR Won DJ Zhang F Margine ER Gopalan V Crespi VH Badding JV 《Science (New York, N.Y.)》2006,311(5767):1583-1586
Deposition of semiconductors and metals from chemical precursors onto planar substrates is a well-developed science and technology for microelectronics. Optical fibers are an established platform for both communications technology and fundamental research in photonics. Here, we describe a hybrid technology that integrates key aspects of both engineering disciplines, demonstrating the fabrication of tubes, solid nanowires, coaxial heterojunctions, and longitudinally patterned structures composed of metals, single-crystal semiconductors, and polycrystalline elemental or compound semiconductors within microstructured silica optical fibers. Because the optical fibers are constructed and the functional materials are chemically deposited in distinct and independent steps, the full design flexibilities of both platforms can now be exploited simultaneously for fiber-integrated optoelectronic materials and devices. 相似文献
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以武夷山风景名胜区植物群落调查样地资料为基础,运用物种丰富度、多样性指数及均匀度指数对构成该区森林景观的6类森林类型(马尾松林、杉木林、经济林、竹林、阔叶林和茶园)的物种多样性进行测定与分析。结果表明:6类森林景观不同生长型的物种丰富度存在差异,表现为灌木层物种丰富度较高,而乔木层与草本层物种丰富度较低,除个别森林类型外,各森林类型物种丰富度的垂直结构为灌木层>乔木层>草木层;不同森林景观类型的物种多样性亦存在较大差异,总体趋势为阔叶林>马尾松林>杉木林>竹林>茶园>经济林,符合物种多样性的一般性规律,即天然林景观>半人工林景观>人工林景观;基质景观天然马尾松林不同演替阶段的物种多样性随演替进展而逐渐增加。不同研究区物种多样性比较结果表明,武夷山风景名胜区具有较高的物种多样性。 相似文献
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天然更新檫木林竞争规律研究 总被引：19，自引：1，他引：19
通过对4种竞争指标的比较筛选，以Hegyi单木竞争指标地天然更新的檫木林种内和种间竞争强度进行了定量分析，结果表明，檫木种内竞争强度随胸径增大而逐渐减小，种间竞争强度大于种内竞争强度，竞争强度与檫木胸径之间存在显的双曲线非线性回归关系，天然更新檫木林竞争规律的研究不仅具有生态学价值，同时还可以为檫木母树林营造以及阔叶林天然更新技术完善提供有益的指导。 相似文献
10.
Dong-Jin Kang Koichi Futakuchi Young-Jin Seo Pisoot Vijarnsorn Ryuichi Ishii 《Journal of Crop Science and Biotechnology》2011,14(4):311-315
Twenty-six upland lines of New Rice for Africa (NERICA) were tested with four Oryza sativa varieties in relation to Fe toxicity tolerance under hydroponic culture containing 1.44 mM Fe (+Fe) and 0 mM Fe (-Fe as a
control). Three NERICAs, WAB450-IBP-24-HB (P24), WAB450-IBP-82-1-1 (P82), and WAB450-IBP-163-3-1 (P163) among the 30 lines/varieties
tested possessed relatively strong tolerance judging from reduction of root length and dry weight and shoot dry weight in
+Fe compared to -Fe and from iron toxicity score (ITS) in +Fe. Only P24, P82, and P163 showed emerged lateral roots from pericycle
at the root elongation zone, whereas in the other 23 NERICAs and four O. sativa varieties lateral root was not observed in the root elongation or differentiation zones. Less disruption of cortex on root
tissues was observed in P24, P82, and P163 than in WAB450-16-2-BL2-DV2 (BL2-DV2), the most susceptible NERICA identified.
P24, P82, and P163 showed significantly lower Fe content in the shoots than BL2-DV2, suggesting that the tolerant NERICAs
could have some mechanism to inhibit the absorption of Fe. The emergence of lateral roots from the root elongation zone in
the three tolerant NERICAs would be closely associated with reducing Fe absorption into the plants. 相似文献