Professor Arkadiusz Nowak, together with a team of botanists from Poland, China and Germany, evaluated the impact of environmental variables on the development of alpine vegetation, mainly grasslands and so-called alpine mats. These vegetation types are fundamental to the preservation of pastoral cultures and grassland productivity in the area of the so-called third pole of the Earth. It turned out that improvement in the quality of pastures can only occur with the maintenance of proper moisture content expressed by the sum of precipitation during the growing season. Exclusion from grazing by fencing is of much lesser importance and does not give very good results.<\/p>\n
<\/p>\n
Abstract<\/strong><\/p>\n Overgrazing and warming are thought to be responsible for the loss of species diversity, declined ecosystem productivity and soil nutrient availability of degraded grasslands on the Tibetan Plateau. Mineral elements in soils critically regulate plant individual's growth, performance, reproduction, and survival. However, it is still unclear whether plant species diversity and biomass production can be improved indirectly via the recovery of mineral element availability at topsoils of degraded grasslands, via grazing exclusion by fencing for years. To answer this question, we measured plant species richness, Shannon-Wiener index, aboveground biomass, and mineral element contents of Ca, Cu, Fe, Mg, Mn, Zn, K and P at the top-layer (0 - 10 cm) soils at 15 pairs of fenced vs grazed matched sites from alpine meadows (n = 5), alpine steppes (n = 6), and desert-steppes (n = 4) across North Tibet. Our results showed that fencing only reduced the Shannon-Wiener index of alpine meadows, and did not alter aboveground biomass, species richness, and soil mineral contents within each grassland type, compared to adjacent open sites grazed by domestic livestock. Aboveground biomass first decreased and then increased along with the gradient of increasing Ca content but did not show any clear relationship with other mineral elements across the three different alpine grassland types. More than 45% of the variance in plant diversity indices and aboveground biomass across North Tibet can be explained by the sum precipitation during plant growing months. Structural equation modelling also confirmed that climatic variables could regulate biomass production directly and indirectly via soil mineral element (Ca) and plant diversity indices.<\/p>\n <\/p>\n Guo C., Wesche K., Margarint M.C., Nowak A<\/strong>., Dembicz I., Wu J. 2022. Climate overrides fencing and soil mineral nutrients to affect plant diversity and biomass of alpine grasslands across North Tibet. Frontiers in Plant Science. 13:1024954. doi: 10.3389\/fpls.2022.1024954 (IF=6.627; MNiSW=100<\/p>\n post<\/p>\n post<\/p>\n 2023-09-30 07:15:01<\/p>","protected":false},"excerpt":{"rendered":" Profesor Arkadiusz Nowak wraz z zespo\u0142em botanik\u00f3w z Polski, Chin i Niemiec oceni\u0142 wp\u0142yw zmiennych \u015brodowiskowych na rozw\u00f3j ro\u015blinno\u015bci alpejskiej, g\u0142\u00f3wnie \u0142\u0105k i tzw. mat alpejskich. Te typy ro\u015blinno\u015bci s\u0105 fundamentalne dla zachowania kultur pasterskich i produktywno\u015bci traworo\u015bli w obszarze tzw. trzeciego bieguna Ziemi. Okaza\u0142o si\u0119, \u017ce poprawa jako\u015bci pastwisk mo\u017ce nast\u0105pi\u0107 tylko przy utrzymaniu…<\/p>","protected":false},"author":13,"featured_media":71474,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","ngg_post_thumbnail":0,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[474],"tags":[],"class_list":["post-71473","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informacje-naukowe"],"taxonomy_info":{"category":[{"value":474,"label":"Informacje naukowe"}]},"featured_image_src_large":["https:\/\/ogrod.pan.pl\/wp-content\/uploads\/2024\/10\/a3-scaled-1-1024x683.jpg",1024,683,true],"author_info":{"display_name":"Agnieszka Pfeiffer","author_link":"https:\/\/ogrod.pan.pl\/en\/author\/agnieszka-pfeiffer\/"},"comment_info":0,"category_info":[{"term_id":474,"name":"Informacje naukowe","slug":"informacje-naukowe","term_group":0,"term_taxonomy_id":474,"taxonomy":"category","description":"","parent":0,"count":129,"filter":"raw","term_order":"0","cat_ID":474,"category_count":129,"category_description":"","cat_name":"Informacje naukowe","category_nicename":"informacje-naukowe","category_parent":0}],"tag_info":false,"meta_box":{"mb_document_group":[]},"_links":{"self":[{"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/posts\/71473","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/comments?post=71473"}],"version-history":[{"count":0,"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/posts\/71473\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/media\/71474"}],"wp:attachment":[{"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/media?parent=71473"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/categories?post=71473"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ogrod.pan.pl\/en\/wp-json\/wp\/v2\/tags?post=71473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}