{"id":2055,"date":"2019-07-22T16:40:27","date_gmt":"2019-07-22T16:40:27","guid":{"rendered":"https:\/\/mbgecologicalrestoration.wordpress.com\/?p=2055"},"modified":"2019-07-22T16:40:27","modified_gmt":"2019-07-22T16:40:27","slug":"things-are-not-always-better-on-the-sunny-side","status":"publish","type":"post","link":"https:\/\/nher.blog\/index.php\/things-are-not-always-better-on-the-sunny-side\/","title":{"rendered":"Things are not always better on the sunny side!"},"content":{"rendered":"

Chris Birkinshaw is an assistant curator in the Missouri Botanical Garden\u2019s Madagascar Program<\/a>, based in Antananarivo. He describes his observations on forest succession at Ankafobe, a site in the central highlands.<\/p><\/blockquote>\n

Anyone flying over Madagascar\u2019s highly dissected central highlands will be struck at first by the vast grasslands that dominate this landscape.\u00a0 But, those looking more carefully will also detect pockets of forest within the rich network of valleys.\u00a0 These forests have a distinct fauna and flora but, perhaps because of their small size, they have attracted little interest from conservationists.\u00a0 Consequently, in the last few decades, the majority have been degraded or entirely destroyed as their trees were cut for timber or charcoal and the relicts burnt by wild fires that rage over this landscape in the dry season.<\/p>\n

The Ankafobe Forest, located some 135 km NW of Antananarivo, is currently being designated as new protected area by Missouri Botanical Garden\u2019s Madagascar Research and Conservation Program.\u00a0 It is one of the larger remaining areas of highland forest but, here too, the forest has been impacted by exploitation for timber and charcoal and burning by wild fires.<\/p>\n

Efforts are underway to restore this forest to its former extent in the recent past.\u00a0 This is no easy task because away from the current forest edge tree seedlings are subjected to harsh conditions: soils impoverished and compacted by annual burning, grasses that compete greedily for water and nutrients, an extended 7-month long dry season, and exposure to hot sunshine and strong desiccating winds.\u00a0 Even when firebreaks are used to prevent wildfires from penetrating the grassland surrounding the forest, few tree seedlings<\/a> naturally colonize outside of nurturing limits to the forest.<\/p>\n

Few but not none.\u00a0 A closer inspection of the landscape reveals some woody plants in the grassland on the less sunny south-facing slopes surrounding the forest (south is less sunny because Madagascar is in the southern hemisphere). Perhaps then the forest could be helped to expand by planting young trees preferentially on these slopes?<\/p>\n

\"Ankafobe
Vegetation is lusher on south-facing slopes (left) compared to north-facing slopes (right) at Ankafobe, a proposed conservation area in highland Madagascar.<\/figcaption><\/figure>\n

To test this idea in 2017 we planted 25 nine-month old seedlings of each of four native tree species in grassland 20 m from the forest edge on both a south-facing slope and a north-facing slope.\u00a0 The species were selected for this test are native to the Ankafobe Forest and were available at the local tree nursery when the experiment was installed.\u00a0 After 12 months the survival and growth of these young plants were measured.<\/p>\n

All four species survived well on the south-facing slope but only one species, Nuxia capitata<\/em><\/a>, had good survival on the north-facing slope.\u00a0 Mortality of Uapaca densifolia<\/em><\/a> was total on the north-facing slopes.\u00a0 Growth was sluggish on both the south-facing and north-facing slopes with the exception of Nuxia capitata<\/em> on the south-facing slope that had a mean 12-month growth exceeding 20 cm.\u00a0 These results suggest that south-facing slopes may provide the best results, at least at Ankafobe, for forest restoration endeavors.<\/p>\n\n\n\n\n\n\n\n\n
<\/td>\nSouth- facing<\/strong><\/td>\nNorth-facing<\/strong><\/td>\n<\/tr>\n
Species<\/strong><\/td>\n% Survival<\/strong><\/td>\nAverage growth (cm)<\/strong><\/td>\n% Survival<\/strong><\/td>\nAverage growth (cm)<\/strong><\/td>\n<\/tr>\n
Eugenia pluricymosa<\/em><\/td>\n72%<\/td>\n4.1<\/td>\n8%<\/td>\n3.0<\/td>\n<\/tr>\n
Baronia taratana<\/em><\/td>\n88%<\/td>\n9.1<\/td>\n28%<\/td>\n12.4<\/td>\n<\/tr>\n
Nuxia capitata<\/em><\/td>\n96%<\/td>\n21.5<\/td>\n100%<\/td>\n8.7<\/td>\n<\/tr>\n
Uapaca densifolia<\/em><\/td>\n72%<\/td>\n10.5<\/td>\n0%<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Aspect \u2013 the direction that a slope faces \u2013 makes a big difference for vegetation in the temperate zone, especially in dry places. But it is not often considered in tropical ecology. Directly or indirectly, the difference in sun exposure between the slopes at Ankafobe can make the difference between life and death for young trees growing in this hostile, water-stressed environment.<\/p>\n

To read more blog posts about the restoration efforts at Ankafobe, please click here<\/a>. You may also read a 2019 open access paper about seedling trials at this site here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

MBG’s Chris Birkinshaw observes the native tree seedlings seem to grow better on shadier, south-facing slopes in harsh, highland Madagascar.<\/p>\n","protected":false},"author":1,"featured_media":2063,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[5,17,21,35,37],"tags":[68,94,113,343,628,801,909],"class_list":["post-2055","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-africa","category-forest-restoration","category-madagascar","category-tropical-ecological-restoration","category-tropical-forest-restoration","tag-ankafobe","tag-aspect","tag-baronia-taratana","tag-eugenia-pluricymosa","tag-nuxia-capitata","tag-seedling","tag-uapaca-densifolia"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/nher.blog\/wp-content\/uploads\/2019\/07\/ankafobe-nursery-2015.jpg?fit=2048%2C681&ssl=1","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/posts\/2055","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/comments?post=2055"}],"version-history":[{"count":0,"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/posts\/2055\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/media\/2063"}],"wp:attachment":[{"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/media?parent=2055"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/categories?post=2055"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nher.blog\/index.php\/wp-json\/wp\/v2\/tags?post=2055"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}