01299nas a2200193   4500008004100000245011600041210006900157260001200226300001400238490000700252520062700259653002300886653001500909653000900924100001600933700002100949700001900970856011600989       1997                        eng d00aSoil in relation to distribution and growth performance of Isoetes dixitei Shende in the Western Ghats of India0 aSoil in relation to distribution and growth performance of Isoet  c1997///  a317 - 3220 v383 aSoils collected from the natural habitats of I. dixitei Sende have been analysed for the available plant nutrients. The amount of nutrients have then been correlated with the growth performance of this species. The preceding analysis reveals that the habit of plants of I. dixitei are influenced by many overriding soils. However, the occurrence of stunted growth of some populations may be attributed to a comparatively high zinc and copper contents in the soils since these two minerals have been found to exhibit a significant though negative correlation with the plant lengths of the various populations of I. dixitei.10aGrowth performance10aI. dixitei10aSoil1 aWagai, S.O.1 aSrivastava, G.K.1 aSrivastava, M.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0031390381&partnerID=40&md5=8ddd377723a6deeecdee3a6d2352cba002606nas a2200253   4500008004100000245017900041210006900220260001200289300001400301490000800315520172500323653002802048653001602076653001402092653002002106653000902126653002002135100001402155700001602169700001402185700002002199700001602219856011702235       2009                        eng d00aCompetition in microcosm between a clonal plant species (Bolboschoenus maritimus) and a rare quillwort (Isoetes setacea) from Mediterranean temporary pools of southern France0 aCompetition in microcosm between a clonal plant species Bolbosch  c2009///  a115 - 1240 v6343 aBolboschoenus maritimus, a clonal species, is locally invasive in Mediterranean temporary pools where it threatens endangered rare plant species such as Isoetes setacea. The combination of management modifications (grazing) and of the progressive accumulation of fine sediments in the pools contributed to the establishment of competitive perennial plants such as B. maritimus. The competitive advantage of B. maritimus on I. setacea has been studied in controlled conditions. The goal of this experiment was to assess the role of environmental conditions in the output of the competition between Bolboschoenus and Isoetes, notably hydrology and soil richness. For this purpose, Isoetes was cultivated alone (three individuals/pot) and with Bolboschoenus (three individuals of both species). The experiment was run with five replicates on six types of sediment (gradient of richness in sand/silt/clay) combined with three hydrological treatments (flooded, wet. and dry). The competitive advantage of Bolboschoenus was measured as the ratio of the production of Isoetes in mixture versus monoculture. The results showed that Isoetes was always outcompeted by Bolboschoenus. However, the competitive advantage of Bolboschoenus on Isoetes, was more related to hydrology than to soil richness. The competitive advantage of Bolboschoenus was very high in wet and flooded conditions and very low in dry conditions. This situation may lead to the extinction, medium-term, of the populations of I. setacea. The introduction of ovine grazing or of cut back practices in temporary pools could reduce the B. maritimus biomass and help toward the conservation of I. setacea populations. © Springer Science+Business Media B.V. 2009.10aBolboschoenus maritimus10aCompetition10aHydrology10aIsoetes setacea10aSoil10aTemporary pools1 aRhazi, M.1 aGrillas, P.1 aRhazi, L.1 aCharpentier, A.1 aMédail, F.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-71549166625&partnerID=40&md5=75f2af6039d9ffd9ec5dc7303a7b161202518nas a2200229   4500008004100000245011800041210006900159260001200228300001200240490000700252520173000259653002401989653004502013653002602058653000902084653001902093100001502112700001302127700001602140700001502156856011702171       2010                        eng d00aAnalyses on soil nutritional status and water pH value in natural habitat of endangered plant Isoëtes orientalis0 aAnalyses on soil nutritional status and water pH value in natura  c2010///  a75 - 780 v193 aThe content of main nutritional components in soil of natural habitat of two plots (Shupowan and Xiaolanhu in Songyang of Zhejiang Province) of Isoëtes orientalis H. Liu et Q. F. Wang was comparatively analyzed, and the pH value of water in plot of Shupowan was determined. On this basis, the factors of soil and water led to I. orientalis endangered were discussed. The results show that contents of organic matter, total nitrogen, available phosphorus, available potassium and total iron ions (including Fe 3+ and Fe 2+) in soil of Shupowan are 102. 7 g · kg -1, 3.1 g · kg -1, 18.1 μg · g -1, 15.0 μg · g -1 and 221. 6 μg · g -1, respectively, and those in soil of Xiaolanhu are 122. 8 g · kg -1, 4. 8 g · kg -1, 13. 7 μg · g -1, 7. 1 μg · g -1 and 240.0μg · g -1, respectively. The contents of organic matter, total nitrogen and available potassium in soil of Xiaolanhu are significantly or very significantly higher than those of Shupowan, while the content differences of available phosphorus and total iron ions are not significant between two plots. But the available potassium content in soil of two plots is very low, while the total iron ion content is rich. The water pH values in upper, middle and down streams of Shupowan are pH 6. 35, pH 6.53 and pH 6.49, respectively, showing approximately neutral. It is suggested that the soil type in the two natural plots is the type which the contents of organic matter, total nitrogen, available phosphorus and total iron ions are rich, and the available potassium content is low. And extreme lack of available potassium in soil and water neutralization are probably the important environmental factors to limit development of I. orientalis population.10aAvailable potassium10aIsoëtes orientalis H. Liu et Q. F. Wang10aNutritional component10aSoil10aWater pH value1 aZhu, W.-J.1 aChen, X.1 aTang, J.-J.1 aZhu, S.-C.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-77954341144&partnerID=40&md5=3478cbd245851411b8c190d3d302d043