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Soil exchangeable base cations along a chronosequence of caragana microphylla plantation in a semi-arid sandy land,China

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Journal of Arid Land 2013年第1期5卷 42-50页

作者： YuGe ZHANG ZhuWen XU DeMing JIANG Yong JIANG College of Biological and Environmental Engineering Shenyang University Shenyang 110044 China State Key Laboratory of Forest and Soil Ecology Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110164 China

As a pioneer leguminous shrub species for vegetation re-establishment, caragana microphylla is widely distributed in the semi-fixed and fixed sandy lands of the Horqin region, North China. C. microphylla planta- tions modify organic carbon （SOC）, nitrogen （N） and phosphorus dynamics, bulk density and water-holding capacity and biological activities in soils, but little is known with regard to soil exchange properties. Variation in soil ex- changeable base cations was examined under C. microphylla plantations with an age sequence of 0, 5, 10, and 22 years in the Horqin Sandy Land, and at the depth of 0-10, 10-20, and 20-30 cm, respectively. C. microphylla has been planted on the non-vegetated sand dunes with similar physical-chemical soil properties. The results showed that exchangeable calcium （Ca）, magnesium （Mg）, and potassium （K）, and cation exchange capacity （CEC） were significantly increased, and Ca saturation tended to decrease, while Mg and K saturations were increased with the plantation years. No difference was observed for exchangeable sodium （Na） neither with plantation years nor at soil depths. Of all the base cations and soil layers, exchangeable K at the depth of 0-10 cm accumulated most quickly, and it increased by 1.76, 3.16, and 4.25 times, respectively after C. microphylla was planted for 5, 10, and 22 years. Exchangeable Ca, Mg, and K, and CEC were significantly （P〈0.001） and positively correlated with SOC, total N, pH and electrical conductivity （EC）. Soil pH and SOC are regarded as the main factors influencing the variation in ex- changeable cations, and the preferential absorption of cations by plants and different leaching rates of base cations that modify cation saturations under C. microphylla plantation. It is concluded that as a nitrogen-fixation species, C. microphylla plantation is beneficial to increasing exchangeable base cations and CEC in soils, and therefore can improve soil fertility and create favorable microenvironments for plant

关键词： cation exchange capacity soil organic carbon soil pH soil fertility caragana microphylla ecological restoration

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Variation in soil water content to rainfall under caragana microphylla shrub in Horqin Sandy Land

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Journal of Arid Land 2010年第3期2卷 174-179页

作者： Wang, ShaoKun Zhao, XueYong Qu, Hao Luo, YaYong Yun, JianYing Chinese Acad Sci Naiman Desertificat Res Stn Cold & Arid Reg Environm & Engn Res Inst Lanzhou 730000 Peoples R China Chinese Acad Sci Grad Univ Beijing 100039 Peoples R China

In order to investigate the spatio-temporal variability of soil water content to rainfall under caragana microphylla shrub in Horqin Sandy Land,a plot of 25 m × 25 m,where there were 6 shrub canopies of C. microphylla,was sited for measuring soil water content at two soil layers of 0-20 cm (top layer) and 20-40 cm (lower layer). Soil water content was measured on the 1st,5th,10th and 15th day after a 42 mm rainfall in Naiman of Inner Mongolia. The results showed that soil water contents at both layers under C. microphylla shrub were gradually decreased after the rain. Soil water content at the top layer outside the shrub canopy was higher than that inside the shrub canopy within 5 days,and became similar inside and outside the shrub canopy on the 10th day after the 42 mm rainfall,and it was lower outside than that inside the shrub canopy on the 15th day. The soil water content at lower layer in the area without shrubs was higher than that under shrub canopy all along. All the measured values of soil water content can be fitted to a variogram model. There was significant autocorrelation of the values of soil water content between top layer and lower layer,except for the fourth measured values of soil water content at top layer. The range and spatial dependence of soil water content at top layer were lower than that at lower layer.

关键词： Horqin Sandy Land caragana microphylla soil water content spatial variability

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Bayesian model predicts the aboveground biomass of caragana microphylla in sandy lands better than OLS regression models

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Journal of Plant Ecology 2020年第6期13卷 732-737页

作者： Yi Tang Arshad Ali Li-Huan Feng School of Life Science Liaoning UniversityShenyang 110036LiaoningChina Department of Forest Resources Management College of ForestryNanjing Forestry UniversityNanjing 210037JiangsuChina Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037JiangsuChina

Aims In forest ecosystems,different types of regression models have been frequently used for the estimation of aboveground biomass,where Ordinary Least Squares(OLS)regression models are the most common prediction ***,the relative performance of Bayesian and OLS models in predicting aboveground biomass of shrubs,especially multi-stem shrubs,has relatively been less studied in *** In this study,we developed the biomass prediction models for caragana microphylla *** is a widely distributed multi-stems shrub,and contributes to the decrease of wind erosion and the fixation of sand dunes in the Horqin Sand Land,one of the largest sand lands in *** developed six types of formulations under the framework of the regression models,and then,selected the best model based on specific ***,we estimated the parameters of the best model with OLS and Bayesian methods with training and test data under different sample sizes with the bootstrap ***,we compared the performance of the OLS and Bayesian models in predicting the aboveground biomass of *** Findings The performance of the allometric equation(power=1)was best among six types of equations,even though all of those models were *** results showed that mean squared error of test data with non-informative prior Bayesian method and the informative prior Bayesian method was lower than with the OLS *** the tested predictors(*** height and basal diameter),we found that basal diameter was not a significant predictor either in OLS or Bayesian methods,indicating that suitable predictors and well-fitted models should be seriously *** study highlights that Bayesian methods,the bootstrap method and the type of allometric equation could help to improve the model accuracy in predicting shrub biomass in sandy lands.

关键词： bootstrap caragana microphylla Horqin Sandy Land mean squared error prior information

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Stable isotopes reveal varying water sources of caragana microphylla in a desert-oasis ecotone near the Badain Jaran Desert

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Research in Cold and Arid Regions 2018年第6期10卷 458-467页

作者： Hai Zhou WenZhi Zhao ZhiBin He Heng Ren Linze Inland River Basin Research Station Key Laboratory of Ecohydrology of Inland River Basin Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou Gansu 730000 China Lanzhou Information Center Chinese Academy of sciences Lanzhou Gansu 730000 China

Understanding the variation in a plant’s water sources is critical to understanding hydrological processes in water-limited environments. Here, we measured the stable-isotope ratios(δ18 O) of xylem water of caragana microphylla, precipitation,soil water from different depths, and groundwater to quantitatively analyze the proportion of water sources for the *** found that the water sources of C. microphylla differed with the plant’s ages and the seasons. The main water source for young shrubs was upper-soil water, and it showed significant changes with seasonal precipitation inputs. In summer,the proportion contributed by shallow water was significantly increased with increased precipitation inputs. Then, the contribution from shallow-soil water decreased with the decline in precipitation input in spring and autumn. However, the adult shrubs resorted to deep-soil layers and groundwater as the main water sources during the whole growing season and showed much less seasonal variation. We conclude that the main water source of the young shrubs was upper-soil water and was controlled by precipitation inputs. However, once the shrub gradually grew up and the roots reached sufficient depth, the main water sources change from the upper-soil layer recharged by precipitation to deep-soil water and groundwater, which were relatively stable and abundant in the desert ecosystem. These results also suggest that desert shrubs may be able to switch their main water sources to deep and reliable water sources as their age increases, and this adjustment to water availability carries significant importance for their acclimation to the desert habitat.

关键词： water-use pattern oxygen stable isotope water sources caragana microphylla

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ISSR analysis of caragana microphylla(Leguminosae) in different temperature gradients

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Research in Cold and Arid Regions 2015年第1期7卷 99-103页

作者： WenDa Huang XueYong Zhao YuLin Li YuQiang Li YaYong Luo Jing Feng Na Su Naiman Desertification Research Station Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

caragana microphylla is the most dominant and constructive shrub species in the Horqin Sandy Land of northeastern China. We evaluated the level of genetic variation within and among C. microphylla populations sampled from three different temperature gradients in the Horqin Sandy Land by using inter-simple sequence repeat polymorphism （ISSR） molecular markers. The results show that eight ISSR primers generated 127 bands, of which 123 （96.85%） were polymorphic. At the species level, genetic diversity was relatively high （P = 96.85%, h = 0.3143, I = 0.4790）. The highest genetic diversity was observed in the Subp6 population from low temperature regions, whereas the lowest diversity was found in the Subp2 population from high temperature regions. Six populations of C. microphylla clustered into two clades. These results have important implications for restoring and managing the degraded ecosystem in arid and semi-arid areas.

关键词： caragana microphylla temperature gradients ISSR Horqin Sandy Land

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Interspecific Transition Among caragana microphylla, C. davazamcii and C. korshinskii Along Geographic Gradient. Ⅰ. Ecological and RAPD Evidence

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Acta Botanica Sinica 2003年第10期45卷 1218-1227页

作者：马成仓高玉葆刘惠芬王金龙郭宏宇南开大学生命科学学院淮北煤炭师范学院生物系淮北235000

The former plant population survey has shown that three genetically-related species, caraganamicrophylla Lam., C. davazamcii Sancz. and C. korshinskii Kom., form a geographical replacement series inNei Mongol Plateau. The present study on population distribution, taxonomy, morphology, development andgenetic structure demonstrated that the geographical distribution of these three species was successiveand in gradual change, thus forming a geographical cline which extended from the east to the west of NeiMongol Plateau. With an analysis of climate change over time, it was considered that the formation of thisgeographical cline was a result of plant adaptation to its natural environment.

关键词： caragana microphylla C. davazamcii C. korshinskii interspecific transition alonggeographical gradient Morphology Taxonomy RAPD

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Grazing and heat stress protection of native grass by a sand-fixing shrub in the arid lands of northern China

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Journal of Arid Land 2022年第8期14卷 867-876页

作者： Keiichi KIMURA Akito KONO Susumu YAMADA Tomoyo F KOYANAGI Toshiya OKURO Department of Ecosystem Studies Graduate School of Agricultural and Life SciencesThe University of TokyoTokyo 113-8657Japan Graduate School of Environmental Studies Nagoya UniversityAichi 464-8601Japan Faculty of Agriculture Tokyo University of AgricultureKanagawa 243-0034Japan Field Studies Institute for Environmental Education Tokyo Gakugei UniversityTokyo 184-0015Japan

Shrub species are used in restoration projects on dryland for their facilitation effects,which include environmental improvements and protection from herbivore *** effects on forage grasses are potentially important in improving grazing capacity on ***,the morphology-dependent performance of benefactor plants in facilitating forage species growth and supplementation under moderate grazing intensity remains ***,our main purpose was to measure facilitation performance in terms of the survival of a native forage grass,Agropyron cristatum(L.)Gaertn.(Gramineae).,in accordance with the growth conditions of a sand-fixing benefactor shrub,caragana microphylla Lam.,in the Hulun Buir Grassland,northern *** study sites with patches of *** and *** were established at the foot of fixed sand *** each site,five quadrats were set in places where *** coverage was 100%and *** grew among the shrubs(shrub quadrats),and another five were set where *** grew alone without ***(grass quadrats).We measured the morphological traits of *** and *** in all 60 quadrats,along with the soil water content and soil *** data were compared between the shrub and grass quadrats by generalized linear mixed-effect models to assess the shrub's facilitation *** also used such models to elucidate the relationship between the average height of *** and the morphological traits of *** in the shrub *** maximum height,average grazed height,and the number of seed heads of *** were greater in the shrub quadrats than in the grass *** soil surface temperature was lower in the shrub *** maximum height and seed head number of *** were positively associated with the average height of *** results suggest that the grazing impact and heat stress were smaller in shrub quadrats than in grass quadrats,and that

关键词： caragana microphylla dryland ecosystem restoration facilitation grazing impact heat stress

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