tailieunhanh - Báo cáo khoa học: "Estimating stand biomass in the Tamaulipan thornscrub of northeastern Mexico"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Estimating stand biomass in the Tamaulipan thornscrub of northeastern Mexico. | Ann. For. Sci. 59 2002 813-821 INRA EDP Sciences 2002 DOI forest 2002079 813 Original article Estimating stand biomass in the Tamaulipan thornscrub of northeastern Mexico José Návara Eduardo Méndeza and Virginia Daleb aFacultad de Ciencias Forestales UANL Km 145 Carretera Nacional Linares . 67700 Mexico b Environmental Science Division Oak Ridge National Laboratory Oak Ridge TN USA Received 28 January 2002 accepted 27 June 2002 Abstract - This paper presents information on below and aboveground standing biomass measurements and estimates using quadrat attributes in the Tamaulipan thornscrub of northeastern Mexico. Biomass components . leaves branches stem and roots were measured in 55 5 m X 5 m quadrats across northeastern Mexico. Total aboveground standing biomass was estimated on a per ha basis using six equations from two additive procedures and contrasted against two conventional sets of equations. The results indicated that total standing weighted biomass averages Mg ha-1 composed of leaf Mg ha-1 branch Mg ha-1 stem Mg ha-1 and root Mg ha-1 biomass. The additive equations developed in seemingly unrelated linear regression that use quadrat attributes provided unbiased biomass estimates within the range of precision reported by conventional procedures. The additive equations are recommended for use in estimating total stand biomass for several land management issues. seemingly unrelated linear regressions Résumé - Estimation de la biomasse sur pied de buissons épineux dans la region de Tamaulipan au nord-est du Mexique. Cet article pré-sente des informations provenant de mesures et d estimations de biomasses aériennes et souterraines surpied des buissons épineux de larégion du Tamaulipan au nord-est du Mexique. Les composantes de ces biomasses furent mesurées sur 55 placeaux carrés répartis dans le nord-est du Mexique. Au niveau de chaque placeau la biomasse totale sur pied fut estimée au moyen