作 者：
郭春秀;马俊梅;何芳兰;王理德;李金辉;安富博;袁宏波;刘开琳
关键词：
石羊河下游;荒漠草地;黑果枸杞群落;植被特征;土壤特性
摘 要：
通过对石羊河下游4种不同类型荒漠草地黑果枸杞群落物种组成及土壤特性的研究,结果表明:1)所调查群落中共有植物31种,分属9科27属,其中灌木植物12种,多年生草本8种,一年生草本11种;单科单属种较多,占到了总科数的50%;且黑果枸杞在不同群落中优势地位明显,对群落的结构、生态系统功能及稳定性具有重要作用。2)相同土层不同类型荒漠草地,0~10cm、10~20cm、20~40cm及40~60cm下盐碱地有机碳含量最高,其值分别为1.08%、0.98%、0.89%、0.972%。与沙地相比,土壤有机碳(盐碱地)差异显著(P<0.05),土壤速效钾盐碱地(除20~40cm外)和土壤全磷含量(盐碱地0~10cm)差异显著(P<0.05),土壤全氮、碱解氮、有效磷、全钾含量没有显著性差异(P>0.05)。同一类型荒漠草地不同土层,土壤有机碳、土壤有效磷(盐碱地)、土壤全钾(沙丘)、土壤全磷(盐碱地和砾石)具有明显的表聚效应。3)不同类型荒漠草地土壤微生物量总体表现为盐碱地>沙地>固定半固定沙地>砾石,不同类型荒漠草地土壤微生物量差异不同,盐碱地中4种酶活性均为最高,同一类型荒漠草地不同土层,随着土层的加深,土壤微生物量和蔗糖酶逐渐减少。4)土壤有机质与微生物生物量碳、微生物生物量氮和磷酸酶、蔗糖酶呈极显著正相关(P<0.01),与脲酶和过氧化氢酶呈显著正相关(P<0.05);土壤全磷含量与脲酶、磷酸酶、蔗糖酶呈极显著正相关(P<0.01),与微生物量氮呈显著正相关(P<0.05)。土壤速效钾含量与微生物量碳和磷酸酶呈极显著正相关(P<0.01)。
译 名：
Structural features of Lycium ruthenicum communities and associated soil characteristics on different types of desert rangeland in the lower reaches of the Shiyang River
作 者：
GUO Chun-xiu;MA Jun-mei;HE Fang-lan;WANG Li-de;LI Jin-hui;AN Fu-bo;YUAN Hong-bo;LIU Kai-lin;State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating;Gansu Desert Control Research Institute;Minqin National Station for Desert Steppe Ecosystem Studies;
单 位：
GUO Chun-xiu%MA Jun-mei%HE Fang-lan%WANG Li-de%LI Jin-hui%AN Fu-bo%YUAN Hong-bo%LIU Kai-lin%State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating%Gansu Desert Control Research Institute%Minqin National Station for Desert Steppe Ecosystem Studies
关键词：
the lower reaches of Shiyang River;;desert rangeland;;Lycium ruthenicum community;;vegetation structural features;;soil characteristics
摘 要：
The species composition and soil characteristics of black wolfberry communities in four different types of desert rangeland(loose sand dunes,salt flats,gravels,vegetated or semi-vegetated dunes)in the lower reaches of the Shiyang river were studied.Key content of this paper includes:1)Among the plant communities investigated,there were 31 species(12 shrub plants,8 perennial herbs and 11 annual herbs)belonging to 9 families and 28 genera.Hence the community structure at each studied site typically comprised a few families represented by a single taxon from one or more genera.Lycium ruthenicum had a dominance role in each of the4 communities with ‘importance values' of 58.9%,17.6%,18.2% and 38.1%,respectively,for the above 4 site categories.Only at the gravel flats site was another species more important(Setaria viridis,28.9%).2)A range of soil chemical properties are tabulated for 0-10 cm,10-20 cm,20-40 cm,and 40-60 cm soil depths.Soil organic C for the 0-10 cm soil depth was 0.30%,1.08%,0.29%,and 0.37%(mean s.e.±0.05%),respectively,for loose dune,salt flat,gravel and vegetated dune sites.The measured soil properties generally did not vary significantly with soil depth,but along with SOC,soil total P and available K were markedly higher in saline flats than at the other site categories.3)Site rankings for soil microbial biomass were saline soil(-300 mg·kg-1)>loose sand>vegetated dunes>gravel(-125 mg·kg-1).Soil enzyme activities are reported for the 4 soil depths for catalase,sucrose,urease,phosphatase and invertase,and were highest in the saline soil in each case.4)There was a significant positive correlation between soil organic matter and microbial biomass carbon,microbial biomass nitrogen,phosphatase and sucrase(P<0.01),and a significant positive correlation with urease and catalase(P<0.05).Phosphorus content was significantly positively correlated with urease,phosphatase and invertase(P<0.01),and positively correlated with microbial biomass carbon(P<0.05).Soil available potassium content was significantly positively correlated with microbial biomass nitrogen and phosphatase(P<0.01).
